Typo in my earlier reply...look for Let’s Build A Graflex on YouTube. I have no idea what the opinions are of the author on the forum, and he admits at many points that he is showing you what works for him, but not necessarily the best methods...that said, I gained a ton because it was an organized and complete build, start to finish. If you are starting with a Graflex, you will certainly pick up some things.
Darth Chasm seems to have a ton more experience than I do, but personal opinion...the Graflex shop has a great and accurate flashgun replica which I had a blast with. The replicas that the top and bottom screw together (and the clamp is decorative rather than holding the two halves together) was way easier for me when I was starting out. Also, if you are interested in the Graflex from the latest movie, KR sabers has something dropping any day now which I am excited to get my hands on.
If you haven’t done so, watch the sticky video of Yoda building a Graflex for a publication. Watching that had me dead set on building my Graflex and I ended up doing 2 in a row as my 2nd and 3rd builds. Good luck!