There are a number of good places to learn to make Pure Data patches!
List of tutorials: ResourcesToStartLearning — Pd Community Site
This is a good video series on Pd that you might have run across:
There’s actually some great examples/tutorials built into Pure Data:
Please do - it’s best to ask the community with specifics. Maybe there’s already a patch out there that does what you need - like in this thread: SID chip patch a la WebSID, QuadraSID, et al?