[PedroDiogo_]

This semester I had a course where we had to implement a MIPS based processor from the ground up, with pipeline, caches, forwarding, and other techniques. I recommend starting with a basic non-pipelined MIPS processor, as it is not hard to find information, and go from there.

We had to use VHDL, and also used some predefined ports, so we hadn't to create everything from nand gates like you are trying to do. The book we used was "Computer Architecture: A Quantitative Approach" by Hennessy & Patterson.