Cool, at first a few dollars here and there from renting out sig links may not seem a lot but if it helps you get a .com or pay a months hosting it means you already have a thing or two covered. I wish you all the best by the way.
Best way is buy reseller account of lots of space at cheap rates from MuthaHostings.com and then sale it on forums or create your own site and promote it via adwords people are selling adwords at 7$ for 50$ activated adwords account you can earn atleast near to 500$ in this way try some other ways too. Regards, Abhisek