Welcome to the FTF Community. The locals generally ask the new members to stop by the Introductions and tell us a little about yourself. That is up to you if you want to do that or not.
The first place to start are the Stickied threads at the top of this section. There is so much free information, you will change your mind on WHAT TYPE of AR to build 2 or 3 times before you read it all.
Then come back with a few pointed questions as you will have a bag full.