Guitar Pro won't change any tab into music. I believe it may import midi files, but I never use that function.
Now here's my opinion.... Guitar Pro is awesome! If you know where to look there are still plenty of tabs for GP online. IMO, the tabs are *not* mostly incorrect, but that's a matter of interpretation. I find that most of them are in the correct key and do a good job of giving you what you need to learn the song.
I've used Guitar Pro in conjunction with Hal Leonard transcribed books and had good luck with the GP tab being complimentary to the books.
With Guitar Pro you can slow down and loop sections of tab. Many tabs contain drum, bass, keyboard, strings, etc... so that you can create backing tracks, plus remove any track, or play along with your own part until you learn it. As a beginner I'm guessing you are wondering if GP will help you learn, not so much allow you to create your own tab. If so then I highly recommend it. I use it as a learning tool and can't really comment on it's tab authoring functions.