I'll take you at face value and assume you're really just trying to learn. And I'll assume you're not trying to learn for nefarious reasons, although that's not totally clear at this point.

If so, I'll let you know that this just won't work. Look at the password rules for Skype. See the minimum length. Look at how many characters can comprise a password - that is, what symbols on your keyboard. And keep in mind that some services even allow non-English characters in their passwords - so there could potentially be symbols in a non-English alphabet to consider.

If you do the math to find out how many possible passwords there are, at a minimum assuming the minimal password length, you will get a very, very large number.

Now go try to manually log on to Skype. Purposely enter an incorrect password. After a few you'll probably get a Captcha to solve. This script can't handle that case. Even if it could, keep going and the account will get locked out. You're dead in the water at that point.

So if you take the number of tries it took to get locked out, you'll see that it's is very small compared to the number of possible passwords. So small that the chances of this technique working against a competently designed authentication system are effectively zero.

If you want to learn, try starting with Bruce Schneier. You probably won't pick up too much practical from his blog, but there's a lot of good security related theory and info there, both on the posts and the comments. There are some good practical courses online, many cheap or free.