This is the right place for anything GM OBD1.

In regards to software, I'd recommend downloading TunerProRt and getting familiar with that. That would be the program where you can actually data log what your ECM/engine is doing and then figure out what needs to be tweaked.

When you get ready to burn chips, then you'd need a programmer, which can be had from Amazon/ebay for cheap. Search "eprom programmer".