Hi
Welcome to Top Sony.
There are three main pieces of software that are used.
XS++
Setools
Far Manager.
You can find an in depth section on how to get started here:
Tutorials
One rule of thumb is ALWAYS back up your GDFS as this is specific to your phone and if for any reason you "BRICK" your phone or you do something wrong you will need this. If you do not back your GDFS up you will then have a very nice paper weight for your shelf.
Please follow the forum rules and if you want to thank someone please you the thanks buttonthat is located in every post.
Any problems then just ask but please look through the forums first as usually your answer will have been posted numerous times by numerous users that are having or have had the same problems as you.
Good Luck!
Lav