[Bama Man]

If your going with a pretty much "stock" Mauser, with all the military wood, etc., your gonna be kind of limited to your mounts, unless you first get your bolt handle re-done.
The handle will not clear a low mounted scope (and you'll want one if you stay with military wood due to the height of the comb) even if you have the bent handle already.
I don't care for the high rings, as I prefer to tuck my face onto the stock.
I prefer Leopold mounts and rings, they just look nicer to me, and are sturdier,but Weaver style are fine.
One piece are ok also, but may get in the way if you have big hands and fingers, but the one piece also stiffens the receiver a tad too.
You should get a smith to install the mounts, unless you have your own Bridgeport machine, and barrel/receiver jig. He will also most likely bore sight the scope for you, which will help you "put you on paper" to begin with.
If your just shooting a surplus rifle, and surplus ammo, you don't need a $800 scope.
Just find a decent fixed 4 power, by Simmons or Tasco. They are inexspensive, and do the job, for a surplus rifle and surplus ammo.
They are inexspensive enough that, if you find you really enjoy scope shooting, and your rifle really shoots well, your not out much to replace it with a better model or make.
Keep the bell small also, don't buy a 50MM bell if your going with low rings,
it won't work and the bell will touch the barrel.
A 40MM bell will possibly even be too big.
A fixed 4 power with a 32MM bell would do you fine as a starter scope, or even a 3-9X32MM variable. Your smith can recommend the bell size.
You would probably spend enough cash getting the scope mounts, and bolt handle redone already.
NOTHING works better than a well installed set of scope mounts, so, spend the money and get it done right.
Don't waste your money on those "hacksaw off, screw on" bolt handle kits either. Have that done professionally also, unless you MIG, or TIG weld (I prefer MIG), but remember also , you will most likely have to notch your stock to get the bolt handle to clear the wood and "lock". No big project with some patience and a rat tail file and sand paper to finish it with.

I hope this helps out some.
Good luck, and safe shooting.