Small straight chisels, from 3/8 down to 1/16 wide are what I use most for inletting parts. If your stock is pre-shaped, then a fine rasp will do nicely, half round cabinet style is best. Then make up some scrapers, or buy them from a cabinet tool supply. Woodcraft, while pricey, has a nice range of tools, and has tutorials on sharpening just for the asking.
To echo Rich Pierce, it is very hard to build a gun from online advice. Just look at all the replies already! I built my first guns without the internet(a loooong time ago), and you will have a real leg up with many online resources at your fingertips.
Yes, looking at originals is very handy, and at some point, essential, to get the real feel of how things were done. But you can build a perfectly functional gun without access to originals, which happened to be my experience in my earlier guns. Once you get serious about this hobby,and should it turn into a passion, you will be drawn to study, as a moth is to the porchlight.
In the meantime, your focus should be
1) safety: build a thoroughly safe firearm. If your kit has been breeched by the manufr, then you should be covered.
2) functional: your build should work in a safe and reliable manner.
3) stock shaping: since you have a pre-shaped stock, you will be focusing mostly on the first two. But there is a surprising amount of wood that comes off a stock, even a pre-shaped one. I have heard the the Rifle Shoppe stocks don't have much extra wood on them.
I always try to make the gun I'm working on the best one. I really fall in love with the project, and it's a lot of fun. Somewhere during the process, I screw something up, and I take it kinda hard. Getting older, and having more experience, my mistakes are fewer, and I don't take them so hard. So the fun is in better proportion.
I'm just trying to say that you will make mistakes, but try not to let that ruin your day. The ALR community is very helpful when it comes to suggesting fixes.