If you're talking about a full-blown programming-language interpreter, I'm afraid that this is one of those "if you have to ask, then it's really beyond you" sort of questions. I (and others) can help with specific questions but this one is broad and there are whole books written about parts of this problem (parsing and interpreting), so no-one can meaningfully answer with a short post here.

ok... well would you be able to direct me to somewhere that could help me make a text box type object (one where the user can type text into the box on the program). I could use that as a replacement.

I'd suggest taking a look at similar things that other people have written. See this scenario for instance or search for "gui" or "text box".