Welcome Kab ! Start searching for build threads for the type of Fett you'll be building. The more threads you look at, the more the process makes sense. There's a wealth of information on the site. It takes a little time, feel free to ask questions, there's a lot of knowledgeable guys on here thatwould be glad to help you with questions you might have.
I’m actually designing and building my own kit for the MMCC. I may eventually build a Boba kit for display. I am far too short to troop as Boba or Jango. I am currently building a J2P with custom paint. Interior is fiberglassed and dome is bondo-ed. As soon as ear caps are permanently glued and and I figure out an alternative for my RF, I’ll prime and paint. The J2P is mainly just to gain experience. I got the last helmet made by Vassk, sent from Poland yesterday, which will be my main bucket for trooping.