Read as much as you can and figure out which strains you want to grow. Make a list of important criteria (indoor, easy to grow,indica dom, short, cost for example), then hit the seed banks. I've had good experiences with attitude, hemp depot and Nirvana. If you are really worried about leaving a paper trail, send a money order and deliver to an address other than where you are growing. How much caution to excersize depends on where you live and the nature of your grow (commercial is higher risk). I don't know anyone busted for buying seeds. It's usually odor, too many people who know about the grow, or sales that causes problems.