Many people start right where you are. If you're interested in prop making, my best advice is to read as many WIP (Work In Progress) threads as you can. See how other people are making these props. Ask questions. Look at the materials they are using, the mistakes they are making, and the successes they are having.
If you're wanting to build the helmet on your own, you will want to filter your search to 'scratch built' threads where people build their own props from the ground up. Many scratch built helmets come from pepekura (computer file that is printed on paper or card stock, folded and shaped, then made solid with fibreglass and other materials).
This is the best resource for creating anything Boba Fett on the internet, so you came to the right place. Do your research, and when you're ready to start, create a thread and ask for feedback.
