Create your own language?

Like so many complex things, if you have to ask, you're not up to it. Sorry to be blunt, but there you go.

If you don't know how to program at all, you're wasting your time. Hell, even if you can program really well, its still a big task.

Besides, what for? What problem is your own programming language going to solve? Is is a specialised language for a certain task? Chances are its already be done or can be done with existing languages.

And I wouldn't bother with Pascal. C/C++/C# or Java would give you a better grounding in modern programming techniques.