I am an undergraduate student of computer science. I do mathematics on the side. There are some ideas I think are worthy of publishing, and doing so would certainly be good for my academic credentials.
I contacted a professor about this issue and the paper I had prepared was not really written as a math paper. So I need to know how to actually write one. Please, write down all clues you think are noteworthy and link useful pages.
How long should a paper be? Is it a problem if it has just about $10$ pages?
I was told my introduction needs to be longer than it is. Why can I not just write "In this paper, I shall derive formulae for integrals of this form." and proceed further?
This will be a tricky thing to get good answers to sites like this; a lot of the conventions you get from reading papers and writing other things that aren't 'papers'. Briefly on the specific questions: