For an AR, you probably dont need it inspected.
As far as an AR kit, how involved do you want to get? Do you want to completely assemble the lower, and the upper, or do you just want to take a complete lower and attach a complete upper? Or a combo of the two? You can buy a stripped lower and a complete upper, or you could buy a complete lower and assemble the upper!
It all depends on what you want to do and how much you want to spend. Im sure someone else will tell you a bit more about which kits to user, etc. I have never done an AR build (getting ready to though) so I will leave that wisdom for someone who has, and I will be sitting patiently waiting to see what people recommend.