Congratulations, you got a good deal. This will introduce you to the sport.
I have had a lot of enjoyment building two kits. I got them out of the Dixie catalog. One was their Tenn. Mtn rifle kit, which I built pretty much as directed, though I did add a patch box. What a beautiful rifle. It is just a variation of the Ky rifle. I have killed 5 deer with this rifle.
The other, I just bought parts here and there from the Dixie catalog to build a Penn style rifle. It is a Ky rifle with a "Roman Nose" stock. On that one I had to inlet the lock. That takes some care, but it turned out real nice. The bad news was, that curved stock popped me in the cheek when I fired it, I didn't like that so I gave it to my parents for a wall hanger.
Enjoy those rifles and set some time aside in a year or two and build a kit. You won't regret it.
Get the Dixie catalog, it is amazing all the different stocks, barrels, locks, patchboxes etc available, if you want to go to a little more trouble for a custom kit.