If you're a novice at AR building and this is a serious use rifle--I'd suggest taking the solid advice you were given and get a complete rifle from one of the quality rifle makers that were listed. If you are serious about depending for your life on this rifle, don't cut corners, buy a complete rifle or at least a complete upper and a complete lower. If you want a specific suggestion, here's an in-stock rifle from a solid builder with a great reputation, this is what I'd get today if just starting:
Sionics Patrol Rifle. Tip: If you get that rifle, the "upgrade to 2-stage trigger" option is well worth it, I have that trigger in another rifle.
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