Honestly if you want to build an affordable load out without breaking your bank for it, look up the emerson stuff. the new Emerson series fabrics are really nice for what you can call "chinese made". Make sure you get Emerson, and not TMC.
TMC uses a lower quality of fabric and the colors are all wrong so if you end up getting legit shit later on in the future it won't match.
For a BDU/Uniform you can look for some Gen 2 multicam pants from Emerson, they already have the knee inserts and the material is real solid.
Get all that stuff, try the sport. See if you like it, then start spending more money into it.
No point in buying all legit shit when you end up not liking the sport.