There are lot of Software provides services to create a music sheet like Finale and Sibelius. So Guitar Pro too..
Guitar Pro 5 is "All the Tool you need to Progress, Compose, and Accompany Yourself".
Why Guitar Pro 5?
Because for me Guitar Pro is friendly user, easy to use, and simple. And also Guitar Pro have a lot of free tabs for download. Not only that, if you have midi file you can convert it to notation and you can edit it as you want with transpose tools.
try it! http://www.guitar-pro.com/