Jamie you need to buy a good reloading manual. All of the bullet manufactures offer them. I like the one from bullet manufacture more than the ones from powder companies because the powder companies give loads for their powders only and the bullet companies give loads for many types of powder.

As to one powder for both the 7.62X39 and the 30-06, since they have different burning rates it would have to be a compromise and not the best choice for either round. I have used both IMR 3031 ( because that's my favorite for a 30-30 and works well in medium size cases) and IMR 4198 ( a very versatile powder).

jamie keep in mind that reloading for a semi auto is different than reloading for a bolt action. You need to buy "small base dies" to make sure the brass is sized small enough to chamber easily. Remember too that a lot of 7.62X39 brass is not re-loadable. Be sure to use a magnet on all of the 7.62 brass to make sure it is indeed brass and not steel. Also a 7.62X39 does not use the same bullet as most 30 cal. rifles, it uses a .311 diameter bullet, the same as a British .303 not a .308 diameter as american 30 calibers use.

A 7.62X 39 in an semi auto is not the easiest platform for a novice to learn to reload on. For that rifle, cheap military grade ammo is easier and probably as cheap as re-loaded ammo and you won't need to buy more than a box or two of "GOOD AMMO" for hunting.