You will need a minimum of 6 US made parts to be legal.
DPH will have most if not all of the parts you require. Receiver flat (if that's the direction you choose) G2 Fire Control Group (FCG) (hammer trigger disconnector) rivets to assemble with, Pistol grip, Muzzle Break. Look also in the EE (equipment exchange)
Falcon Arms carries Magazine Floorplates and Followers for about $5 for the set. These also count towards your 6 but be advised that you will not be able to shoot Drum type Magazines if you go that route. If you have no plans to use drums, then that is not an issue but you will have to get a set for each mag that you use.
If a muzzle break and pistol grip cost +-$30 for the set you can equip 6 mags for the same price.
You have many options.
There are a probably a few builders in your area so keep an eye out.
There is also a Home town Forum.
AR15.com's AK forums are 1 of several resources (forums) available.
2 others of the better are the AK Files and Gunco.net.
Do lot's of searches for info, probably 90% of your questions will have been asked many many times before and have been answered even more, IOW, multiple replies.
Good luck, have fun, be safe.
Del