Welcome to the salty side.
You can run a 29g with just an aquaclear filter, I used a AC50 on my 29g. You can get a hangon skimmer at some point if you like, or just wait for when you get corals.
Other than the rock and filter you will need a good light for corals, but until then can get away with any light you have or can get cheaply.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.