First off, Welcome to FISD Jason. You've come to the right place to get answers to your questions.
I will echo what everyone above has said. As someone that made mistakes when he started in 2019 because he didn't know where to look and bought armor that really wasn't best for him, do ask lots of questions!
I'm a bigger dude (6'2" 275lbs) and most of the armor isn't make for me. The original actors averaged about 5' 10" and 170lbs (or so I'm told). So the original armor and what most makers imitate (we strive for screen accuracy) is for a person of that size. So if you are bigger or smaller, you need to look at who may make a bigger/small set, or what you may need to do to size the armor to fit you best.
As Glen said, you get what you pay for. Do the research, ask the questions, check with members in your local area to see their armor (and maybe try some of it on), to get as much info as you can.
And please remember to ask questions here, the forum is very active and you will get lots (sometime more than you'd like) feedback.
Best luck on your journey to join us!