Hi there and welcome to BioRUST.
As this is, in your words, a big question, I'm going to move this thread into the Illustration, Sketching & Vector Art forum, where I think it more properly belongs.
I am by no means an expert in this field, but I have done a little searching and found the following - don't know if it's the sort of thing you were looking for:
How to convert TIFF to EPS | TIFF to EPS converter