Hey ^^ Good bird of choice. I would suggest searching petfinder for any locals in shelters/rescues/being relinquished by private owners. Many people do not realize it, but there are a lot of homeless parakeets out there! Birds from a rescue have usually been health tested, and you might be able to get a bonded pair instead of risking buying two and not having them get along.
Anyhoo, advice wise:
- Parakeets are essenially parrots. This means they need a lot of attention (from you or another bird), mental stimulation, toys, out of cage time, or time in an aviary, and require a consistent, warm temperature.
- Single parakeets are more likely to bond to a human owner, but it takes a good deal of time and energy to get a nervous young bird to bond with you, so keep this in mind; if you don't wish to invest the time, please get him/her a friend.
- Parakeets require consistent, every-day attention to stay tame and friendly.
- Males tend to be more human-friendly than females. You can identify a male by the bright blue cere.
- If you wish to have a hand tame bird, seek out birds recently weaned; the older a parakeet is, the harder to tame, and very nervous older birds simply can not be tamed.
- If you just want the birds to look at, listen to, and enjoy, I suggest a pair or more; the benefit of getting more than two birds is that, if one dies, the companion is less likely to get depressed and stop eating.
- If you get several birds, just make sure you have a big enough cage and several food dishes; sometimes, submissive birds are bullied, and if everone eats from the same bowl, they may not get any food at all.
- Parakeets aren't too picky about what genders are together, but I would suggest a nice even mixing of males and females if you get several birds. This way you don't have one boy or one girl being fought for.
- Contrary to what you may see in stores, keets should not be on an all seed diet. Zupreme and Mazuri both make pelleted parakeet diets which are much healthier and can prevent the onset of fatty liver disease. Keets also appreciate treats and supplimentation of fruits, veggies, leafy greens, and seeds. Millet is a fairly low-fat seed treat that parakeets love.
- Most store birds are started on seed, so converting to pellet can be very difficult. Birds WILL starve themselves to death rather than try a new food, so the best method is to mix increasing amounts of pellet with decreasings seed, until the keet is comepelled to eat the pellets.
- NEVER give a parakeet, or any parrot-family bird, avacado; it will kill them.
- Keets love sprouted seeds! Simply take parakeet seed, soak in water until green shoots come out, and offer as a treat.
- You definately need something in the cage to wear the beak and nails if you are not comfortable or do not have a tame enough bird to trim. For beaks, mineral blocks, cuttlebone, and lava rock are great. For nails, calcium perches, lava rock perches, and sandpaper perches are best.
- By having a variety of different perch sizes and shapes, you can strengthen the feet, wear the nails, and keep the bird better entertained.
- Keets like water! They appreciate being misted with a bird mister or fine spray bottle, and most will readily hop in a bird bath placed in the cage.
- If you have mirrors and windows in your room, they must be covered when the parakeet is let out; they tend to fly into these. If you do not want flight, you can clip the flight feathers, or have a vet do this; most birds can still flutter and glide a bit with clipped wings, but can not make full speed, long distance flight with it.
- Always be very sure that your keets have no acess to house plants, electric chords, etc; they may chew on these and be harmed. Also be careful about open toilets, door ways, and your own feet!
- Toys, toys, and more toys! Parakeets are very intelligent birds who love to play. Depending on how large the cage is, you should be able to add a variety of toys. They greatly enjoy mirrors, bells, and things that can safely be chewed on and wrecked.
- Single birds might like a 'hump buddy' in the form of a plastic bird, or cloth shape, in one corner of the cage. They get lonely, too!
- If you get a male and female, you can offer a nestbox for the sake of the female's sanity, but if you don't want babies, you can buy fake eggs and discard the real ones she lays; usually, the keets will just sit on the fake eggs and not produce any more.
- Be careful to avoid drafts (and please, do not keep them outdoors!); they are the number one killer of parakeets. Parakeets prefer a minimum temperature of 68-70 degrees; think of them as tropical fish ^^ However, I wouldn't suggest placing in direct sunlight, as they can get overheated.
- Keets can stress out easily; when you first get yours, cover the cage, turn the lights off, and leave them alone. This is procedure for whenever the bird is stressed - their little hearts beat so fast they can have a heart attack.
- When you are not home during the day, leave a radio or TV on; they enjoy the interaction, sounds, and sights. You can even buy tapes and CDs of bird video and sounds; your keets will get a kick out of it!
- Of course, keep your birds clean. They make this stuff called "bird poop off" that is not toxic to birds and removes feces from the branches. There are several kinds of linings for the bottom of the cage you can use as well. I use newspaper because it is readily available, cheap, and easy to discard of. But corn cob is another popular choice. Just make sure it isn't something your bird would want to eat!
- Birds carry diseases in the feces, esp. salmonella and campylobacter. So be sure to wash you hands thoroughly, avoid inhaling fecal dust, and sterilize anything you use to scrub the cage.
Hm... thats all I can think of r/n. I'll come back later if I think of anything else.
I have a conure myself, but I would not reccomend them to anyone who hasn't thoroughly researched parrots; they are an exotic animal with care specifics that not everyone can handle. 
Parrots will usually (and i repeat, USUALLY!!) only make a large amount of noise for a long when they need something or they're bored etc... (or in the case of my rescues, if they have 'issues'). Whereas, i've found tiels and budgies and lovebirds to be annoyingly noisy - They will just sit there, in or out of the cage, chipring and screeching for no reason! I think my lovebirds are the cutest little things, but they ARE loud! As were the budgies i've had.. 
To add to the comment about fatty liver disease - they are also tumor factories. That shouldn't discourage you though, because almost every bird is proned to one problem or another.
