Learning to shoot a rifle proficiently takes time, and money. My best recommendation for learning to shoot a rifle is get a Ruger 10/22 in .22, put a decent scope on it, and knock yourself out shooting .22 ammo for about 12 bucks per 500 rounds. Once you master that, move up to a decent caliber.

I can easily put someones eye out and kill them at 100 yards with a decent .22.

Food for thought.