Improve your technique with a .22 rifle (it's cheaper) - and stay away from any high-tech scopes, etc.
Those can come later, with more experience/training.
In fact, if you have a .22 with iron sights, it will serve you best for training yourself.
Start shooting at large cardboard squares, fairly close - say, 25 yards away.
Practice on those, using a different position (sitting/standing/kneeling) on each target - until your groups are consistantly smaller.
Don't shoot so much at any one session, that you start to lose concentration and/or fine muscle control. Quality is more desireable at this point than quantity.
Repeat, at a longer distance and/or with a target that's half the size of the first.
Stay with that regimen, until you see some improvement, then make it slightly harder for yourself - until you get to a point of diminishing returns, which we all hit, although at different levels.