If this site of yours is for commercial value please please please pay someone who knows what they are doing.
Even if you are just taking automated BTC deposits and then processng withdraws manually... if your DB skills arent upto scratch someone could inject 1000BTC into the code and wait for you to manually withdrawl. Make sure the person you chose has a track record of producing established and well known sites... not just someone doing it as a hobby, or whoever charges you the least. I could probs fumble around and get it going for you, and then you'll get hacked a week later
However if this is just for fun and you are using testner, well then all the power to ya
and good luck on your educational endevours. Sooooo many resources here and on google to help.
Good luck
and yeah yeah what I am saying is common sense... well it wasnt to bitfloor, mtgox etc etc