Oh yes ! ! The tried and true 91/30 -- good choice ! ! Little easier on the shoulder than the shorter M-44 or M-38's . . .
Let's see now . . . . .
First -- clean the cosmoline off the rifle and out of the bore.
Then get some ammo. You'll need about a thousand rounds to start -- don't laugh ! ! Shoot it a few times and you'll see ! !
Any military surplus WILL BE CORROSIVE ! ! ! But . . . not really a problem. Good old off-the-shelf Windex -- you know , the stuff to clean off your windows -- works just fine. Just spray it down the bore and run a few patches right after your done shooting and you'll be fine (spray the bolt face too). The clean as you would any other rifle when you get home.
As for ammo . . . . Albanian is good (brass cased) and the Polish surplus I just picked up has copper-washed cases. Cheap and reliable too ! ! I've got some Russian copper-washed cased amo that's REALLY good ! -- might be a little harder to find. Seems that some rifles like one type of ammo better than others. Get a selection of ammo and give it a try.
You've made a good choice on the 91/30 --- now start saving-up for the M-44 ! ! !