[A 29 is a small tank and is tough but doable. Don't let people tell you you can't!!
Read as much as you can. Especially about small tanks. And if you take no other advice do take this: GO SLOW!!! Plan, plan, plan, and ask, ask, ask! Many of us here have made enough mistakes to fill a book so ask away and we can help you avoid many of the pitfalls!
Another piece of advice. Figure out what you want to keep. Plan your fish list out before you even put a drop of water in! Also decide what kind of corals you want. Most don't play nice together so it will take some planning with such a small space!
Marc's site is great and you should take the time to read as much of it as you can. If you can afford a skimmer get one. The Remora is an excellent hang on skimmer. It will set you back at least $125 and that is used. This will also be dependant on your livestock (see above). If you just want some zoanthids and mushrooms and a pair of clowns you can definitly get by without a skimmer. If you want more fish and some LPS or other softies the water neads to be a bit "cleaner" and a skimmer would move up the priority list.
You can do a skimmerless but you will need a lot of live rock and incredible husbandry (be religious with at least weekly water changes, stocking very lightly, feeding very little, etc)
If your handy you can do a lot for cheap. You can make your own rock, build our own stand/canopy, do your own wiring, etc. That will make things much much cheaper!]