To be honest, I don't want to discourage you but it's the fact that there is nothing like a free lunch. Even if Facebook claims "Facebook is free and always will be", we know how they are making money and what they are taking from us. Similarly, free Bitcoins sites are taking something other than money so identify the returns on your overall investment. The best way I know is to offer your skills, knowledge, experience and time in the form of attractive/useful services and charging your fees in the form of Bitcoins.