I'll second what starsaber25 wrote. When you get your kit, you'll say like a lot of us have "what have I gotten myself into?" But once you get going, you'll find it easier than you thought! And even more fun than you thought.
I suggest going ahead and getting in touch with your local Garrison. A lot of them have build parties where you can go and they help you do your build. You are already ahead of the game in that you've been researching. That's a very important tip....research. Ask any question you have, no matter what it may be.
While waiting for your kit, go ahead and start collecting supplies....straps, Velcro, snaps, clamps, sharp hobby knife, metal ruler. I recommend e6000 glue. Strong but allows to take pieces apart for adjustments. You'll see people mention CA glue. It's good but it's very strong and wouldn't recommend it if you have little to no experience with it. Get plenty of tape and tape your armor pieces together before gluing to get good fitting and measurements. Take your time, measure twice and cut once and always have a fresh blade in your knife, helps making clean cuts.
Good luck and FISD is always here to help you with your journey!