2rott,
I bought the same rifle as you did and from the same store. Here is what I recommend to start with.
The bases/screws you got with the rifle will be fine. One note of caution with these, make sure you have the the bases on correctly. You will see that one is thicker than the other, that is the rear base. Also, the bases have a make of some type (I don't remember if it wa a number or what) but make sure they are both on the same side. If you get one of the bases backwards, you will not be able to sight it in, you'll run out of horizontal adjustment. Next, get the burris signiture rings with inserts as suggested. When you take these out of the package, use rubbing alcohol and clean the inserts and inside of the rings where the inserts lay. They come with oil on them and if you do not clean it off, there is a chance that the scope will slip in the rings while shooting. Use blue lock-tite on bases but it's not necessary on these ring screws. While mounting the scope in the rings, make sure the insert openings line up with the ring openings (don't have to exact but close), then as you tighten them (very slowly), wiggle the scope lightly and this will allow the inserts to self center the scope.
The brass you picked up at the range is not ideal but will work for initial rifle evaluation and what I mean here is I hope you have a lot more success with your rifle than mine or others I have seen. After 450 + rnds of load development, 1 3/8" 3 shot groups were the best it would do and I have a proven 36T weaver on it and a jewell trigger in it. Quite the bummer. That is why I would use the pick up brass, get some 52gr Sierra HPBT Match and a pound of VV N135 powder, Fed 205M or Winchester small rifle primers and a set of Forrester BR dies (for simplicity). If the gun will not group less than a inch with these components and setup, I wouldn't waste much more time on it. When you get everything together, get on here and ask about tools you need and how to set them up (like the dies).
A very good option also is to find a local BR shooter that has a lot of experience and have him show you the ropes of load development, shooting, etc.
Hovis