Is this the kit you bought?
http://www.midwayusa.com/product/90...polish-under-folding-stock-parts-kit-762x39mm
The guys above are right. You can't start w/ a barreled receiver.
This part in your kit:
holds the barrel with a pin that is oversized for the hole it goes in and is riveted to the receiver. You'll need to know how to do all of that. Also you'll need to know how to populate the barrel with rear sight block, gas block, front sight block.
You'll also need to know how to measure and adjust for the single critical dimension in the whole build (honestly-there's only one. all the rest can be worked around, but that on is a major deal). Mess that up, and you will have a potential safety problem on your hands.
You'll also need to develop a knowledge of 922r and how to comply with it. This involves incorporating certain combinations of US-made parts.
You are going to spend another large chunk of money to do this right. And that's if you don't screw up a part and need to re-buy it.
There are bubba ways to do some of the operations, but they don't always produce the best product and take practice to get right.
Honestly, man. You could keep the kit for spares, buy another AK, and still be ahead on this. Or sell the kit and recoup most of your investment in a complete rifle.
Not telling you what to do here, but please kindly consider what the membership is saying.