There is several ways to earn bitcoins, or to multiply coins you already have. I think there isn't good answers for your questions.
How much you can you earn, or expect to earn is depends from you. How much you know about things available around, what kind of skills you have, how much time and effort you put in all this. Last, and maybe most important, is how much you are prepared to risk money you already have.
Faucets and sig. campaigns are incomes, how much time you have and how much you try that is how much you can expect to earn. To start earning nice amounts you need to invest and risk your money. There is many things around, start by reading this forum with a bit more attention, and see what other people do, then you try it. Try everything with amount that you can risk.