Have you gone over to the marine journal thread? They have some smaller tanks there that you could look off of for information on what you may or may not want/need and also for potential fish ideas. I also think they have something pinned in the
nano section that you could look over too!
Def read this.
Now a days, people are leaning more toward 20x tank turnover. That may be a bit much for a small tank though...you don't want a whirlpool
Definitely plan how you're going to get your water too. If you'll buy R/O or premixed saltwater from a lfs or if you'll get your own r/o system and do it all at home. If you have good access to a lfs and price is good, then it may work out good to just get it from them since you have a small system.
Right off hand you'll need: (usd)
1)A refractometer ($50 at the low end) or a Hydrometer (about $10ish)
2)skimmer if you want one...they aren't nec. as pointed out by ox
3)if you'll mix your own water you'll need
*bucket to mix it ($5-$10 or so)
*good reef salt mixture (depends on if you buy a little bag or go big. The bags I've seen are $15ish plus or minus and I think the big buckets can go for around $50 or more)
*good submersible sw heater for the bucket you're mixing it in($ varies by brand and up to you)
*power head for the mixing bucket to keep it churning to make sure it all gets mixed in good ($-not sure exactly...again it depends on what you want to buy for it and can be a smaller one if you're mixing in a smaller bucket)
A book I highly recommend for someone just starting in sw is The Conscienious Marine Aquarist By Robert Fenner. It's a REALLY good book. It talks a lot about the setup and equipment, here's the titles of the chapters
1. Systems
2.Basic Equipment
3. Filtration
4. Water
5. Setup and Aquascaping
6. Maintenance
7. Marine Algae
8. Foods and Feeding
9. Disease
10. Cyanide Collection
Then it goes to talk about tons of fish and inverts...including eels, lionfish, dottybacks, grammas, jawfishes, cardinalfishes, butterfly and angel fishes, clownfishes, wrasses, blennies and blennylike fishes, tangs, fanworms and feather dusters, mullosks and crustaceans and more!! I highly recommend this one. There are other books out there that you can get for corals. Read the
Realm of Knowledge. That gives other good books too