If I had to guess I would say 95% of the users here have bought things online...lights, nutrients, bulbs, rockwool, etc. I would also guess at least 65% of the users here got their genetics off of the internet.
In my opinion the first step would be learning your country/state's MJ laws on cultivation to consider the risks. NORML's site is good for that if you are American. As far as worrying about getting busted because you bought something online, forget about it. In America there are literally tens of thousands of people buying seeds and growing equipment off the internet every day. Our government can not track down one 6'6 terrorist on dialysis. They have more important things to worry about than the guy that wants to grow a few plants in his basement. Just my opinion.....
-SSF-