When it finishes synchronizing you'll see the coins, don't worry.
Yes, generate a new address for every received transaction, that way it will be easier for you to keep track of who paid you what.
Only deal with trusted sellers, the ones with good reputation, remember.
Thank you for all your help Psy

I appreciate it.
So it is is safe for me to do business while my wallet is still syncing? Or is it best to wait until it is finished? I assume it doesn't really matter (since it seems like the transaction would just be tagged on the end of the update regardless) but maybe for peace of minds sake..