money making in blogging

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I am now enjoying my time here in mylot. my sister though is telling me to try other sites that will give you bigger earnings. I loved it here but I would also like to try some sites. like what is PTC's? I am hearing it a lot but I don't know it. any advise is welcome and appreciated. and what about adsense? what is it? I have an account in blogspot but you should have some followers to earn much( and should have an adsense on it?). I am still absorbing some facts but I am at loss sometimes. I'd like to try so that I might earn money and also have a heck of a time enjoying what I am doing :) so, peeps, help me!:)