Astrophotography

Hi, i'm very much the novice here, with next to no equiptment and even less money to spend but i'm interested in some astrophotography. I understand that you need a decent exposure time to capture anything other than bright sky objects, but to avoid trails you then need some sort of tracking mount. Anyway my question is, is it possible to build such a mount, from scratch, or with some parts, to cut costs. What would you suggest? Kit plans would be nice, pictures, maybe a web link or even some equations but i'm not expecting there to be any of that haha so advice is greatly appreciated
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