Tank Buffer Systems ** Need Help **

Hey guys, I'm pretty new at the marine tank thing. I've had my 30 gallon tank going for about 6 months now, and still haven't introduced any sort of corals or plant life at all. Any suggestions about what I should introduce first, being the most hardy?? Also, I've been recommended a few products, "Bionic Buffer System," "Purple Up," and "Prime 1 & Prime 2." Does anyone have suggestions as to where I can purchase these online?? Any tips and advice is appreciated.