I read this as the OP saying they want to buy "right" first time round, instead of wasting money and then needing to exchange & upgrade later...

.22 is invaluable for training - especially if you plan on shooting centrefires later. Good as it's less powerful, and cheaper for honing your skills in... Plus it'll give you a bit more of an idea later when you want to buy your larger rifles as to what you might, or might not like about them...