AI is something that has interested me, so I have done research on it over the years, and based on the fact that you didn't mention any of the "key terms," I really doubt you have the knowledge necessary to do this. I didn't hear you talking about Backus Naur Grammar, Fuzzy logic, Logical heuristics, Parallel algorithm execution, etc. Those are all things you will need to be VERY familiar with if you want to even attempt AI/NLP.
Basically let me put it this way, I don't believe AI/NLP is overall impossible, but I believe it will be impossible for you. There are thousands of the worlds greatest computer scientists, engineers, biologists, and psychologists working hard on this problem, and they have been working on it for about the last 40 years. Based on your post it would seem you are not familiar with any of their work. If the greatest minds in computer science couldn't come up with it, how are you expecting to? Meaning, you seem to be planning on doing everything from scratch (e.g. when you mentioned learning grammars you never mentioned BNF). This means, even if you did figure out the key to AI it would take you >40 years seeing as how thats how long it took the collective knowledge of all the AI scientists to get this far.
Furthermore, the idea of doing it in mIRC is just laughable. Since when does mIRC allow threading? The human brain is known to have redundant pathways that allow it to do MANY things at once. mIRC doesn't even allow you to emulate such a thing. Everything would be linearly processed rather than in a parallel manner. So expect it to mean, if you said "type my essay for me" even if your AI logic was perfect, and it could do it, it would say "here is your essay" about 5 months from now. You need parallel processing. Then of course there is the fact that mIRCscript is slow. You might be executing 10 trillion operations to solve a single logistical problem, mIRC doesn't have the speed to handle such a thing, actually the x86 processor can't even handle such a thing! Neural network computers, the closest thing to real AI we have, consist of thousands of processors all linked together. Does your PC have 1000+ processors in it? I know mine doesn't, in fact I think x86 is limited to something like 16 (though I could be mistaken).
To sum it up, I think it is a waste of time for you to reinvent the wheel, spend the next 5-10 years studying the work of others, learn a real language, and then try AI/NLP. I wouldn't waste my time trying it now if I were you since I'm 100% sure you will fail.