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C is really quite simple. The only commands are, if, while, do-until, for, return, switch-case, break, continue and goto(to be avoided). How hard can it be to learn what 8 things do. However, if you haven't programmed before then learning program flow is tricky. Hence why it's important that you answer the question, already asked above, do you know any other languages?
I would choose a book which recomends a, preferably free, compiler and that has worked examples. You are probably best learning the language on a PC and then switch to uControllers. A search throws up Lcc which is a free compiler with a tutorial.