What kind of answer are you expecting? You asked what you should work on next. I gave you an answer. Do you want me to hold your hand and tell you exactly how to do it?
There are tons of open source Z80, 6502, 68K, x86 emulators available. All these processors are extensively documented. All of them are available for purchase, new or used, in some form today. Just pick one and do it. The first thing I would do is make a debugger. In my opinion, the 6502 and 68K are easier to work with than the Intel-based processors (Z80 is essentially an Intel 8080).
Let me give you some advice: don’t write people off in this scene. It’s a small community and if you make a fool of yourself people won’t want to help you. Give back more than you take, if you can.
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