Hi mate. Try and find somebody with a rimmie to go out with shooting, before you apply and buy. You really will learn a lot.
I used guntrader to find my rifle. A CZ Style .22lr (new) 3X9X50 IR SCOPE, SAK Mod, spare mag, mounts, harris bipod, sling and swivels and 500 rnds, all for under £400. Just have a good about and haggle a bit, there is always a bargin about. All the best