You can get a lot of good quality ammo cheap. Buy as much as you can now. Surplus does not last forever. You may be able to find a manual online in a PDF. Those are nice to have.
I recommend SGammo.com for good deals on 7.62x54. Watch the heavy ball stuff though, as if I have heard correctly, it can damage a semi auto. Most of the surplus ammo is corrosive, so make sure you clean really well.