I LOVE my Charger! Congratulations on yours!
As far as a scope, I actually had a $10 BSA scope I had laying around that I threw on the gun just to take it to the range the day I got it with the intention of getting something better later. After more than three years it is still fine with no wandering zero.
I believe Bushnell has a fixed power (4x) for ~$30 that gets good reviews on-line. Sorry I don't have the model number handy. Try OpticsPlanet (site sponsor) and look at their offerings in your price range.
My Charger will shoot ANYTHING I feed it so it gets a lot of 36gr.HV/HP Federal Bulk Pack from Wal-Mart. However, for more precision shooting I like the the Federal "Champion" 40gr. solid in the blue box which will produce a nickel-sized jagged hole @ 25yrds. That is good enough for me
IMHO the Charger is a super set-up. I have had 6yo kids consistently hit targets with it (well supervised of course) but it is still capable of delivering what is required by more experienced shooters.
ETA- It is basically a 10/22 with a short barrel so all the controls are the same. Uses standard 10/22 magazines.