SSbot is the easiest setup for 1-30 I've seen. Of course most people do referrals which is level 10, best achieved by using Refboost or FulcrumBot. Both of these bots don't require Virtual Machines or anything else. Simple setup and you're botting. 1gb of ram = 2 bots typically. I have i7-4770k, 16gb ram @ 1866mhz and I can run 40 accounts.