Hi Bulos,
Welcome to
RP.
For a general grounding in retouch technique, I would suggest reading Photoshop Restoration & Retouching by Katrin Eismann. It has chapters devoted entirely to Portrait Retouching and Fashion and Glamour work.
As well as that, browse the forums here at
RP, there's a wealth of technique and tips available (use the search function to find topics that interest you), or if you have a specific question, post it, I'm sure you'll get help from a lot of friendly and skilfull people.