You'll need about 45lbs of
LR, enough aragonite sand to give you at least a 1" sandbed, and a good skimmer to start with. You can use mostly base rock and just a few pieces of
LR to seed it if you're patient enough to wait for the base rock to mature into
LR. There will be some algae battles with this method as pest algae colonizes base rock more easily than
LR. You'll want to upgrade the lighting as soon as you can afford to. I would go with one of the Currents
PC fixtures...I believe they offer the best value available right now. Or, if you're handy, you could easily build a 96w
PC fixture using a ballast from Lowes/Home Depot. I would recommend buying an Aqua C Remora skimmer. I realize this is going to put you over budget, but it will be worth every penny you spend on it. A pair of ocellaris clowns, a small goby of some sort, and maybe a bangaii cardinal would make a nice community for a 30
gal tank. You could have some inverts that have low light requirements as soon as you can get the lighting upgraded.
JMHO.