Cali,
I'd suggest not being overwhelmed by some of the plant info that you see, about how difficult it is.
With the proper research (preferably done beforehand

), and choosing the right plants for your conditions (what fish you have, and what lights you decide to go with, etc.), you can in fact successfully grow plants ...
without buying hundreds of dollars worth of substrate
without buying super-expensive lights
without injecting CO2 (which, by the way, plants use during the "day", not at "night")
without dosing with six fertilizers every day
without an hour of maintenance a day
It's just like many hobbies, in my opinion. You can have plants, or you can have PLANTS!, depending on how far you want to get into it. Here's an analogy: think about outdoor gardening.
Some people will completely landscape every inch of their yards, fertilize every specific plant regularly, water daily, mow the lawn every five days, do general maintenance a couple times a week, and keep every plant meticulously trimmed. Their yards generally look pretty impressive.
However, many people will mow their lawn three times a month, plant a few bushes, maybe a few flowers, maybe water them every once in a while, and clean up once in the spring, and once before winter. Their plants usually do pretty well and stay healthy, there's not a whole lot of work or expense involved, and their yards end up looking pretty attractive, and are a source of pleasure and pride.
Is either approach "wrong"? No, not in my opinion. As long as someone in the second group chooses the right plants (ones that don't require a lot of care, and are pretty hardy), and realize that their yards aren't going to look like Japanese gardens, then all is well.
Same with your aquarium. If you choose plants that meet your conditions (usually hardy, low-light plants for beginners) and keep your water clean (which of course you'd do anyway just for the sake of your fish), and keep your lights on for 10-12 hours per day, chances are you can get pretty good results, without a lot of problems.
Can you grow bunches of rotala with 15 watts of light over a 30 gallon tank? Doubtful.
Will your tank look like a Dutch tank, or an aquascaping contest winner? Nope.
But, chances are, you'll end up with some healthy, good-looking plants (maybe after one or two "oops"es) that will provide both aesthetic and chemical benefits for you and your fish.
Since it doesn't seem that anyone has mentioned it yet, I'd suggest browsing over at
Plantgeeks. Partilularly, the Plant Profile section. **Caution: If you browse the forums there, you can find a lot of really good information and nice people, but keep in mind that quite a few people that post there are really seriously "into" plants. Try not to let that overwhelm you. The weekend gardener can still learn a lot from the Japanese garden landscpaer, even if they end up using methods for different results.
