Everyone here is going to tell you to slow down. I know that you want this so bad you can taste it and they are awesome fish. If you rush this then you are probably going to regret it later.
You are in the right place. Do some research, continue to ask questions, and when you think you are ready ask some more.
Okay so you want a porc. puffer. Understand you cannot have them in a reef set up so you will probably go with a fish only or fish only with live rock (FO or FOWLR). All puffers eat inverts so clams, crabs, sea urchins, shrimp and snails are almost always out of the question (with the very rare exception). You need to figure out what kind of tankmates you would like or will it be a species only tank? Go to the New Hobbyist's forum and read 101 tips for beginners. It will answer about a million questions for you.
I hope this gives you some food for thought.