There are several steps to shooting fundamentals. This video clip does a good job of explaining the different fundamentals.

http://www.youtube.com/watch?v=BGs_GuPiDbI

Seek professional instruction from certified instructors (NRA or other respected affiliations).

It is hard to tell from the video, but here are some areas.

You need to lean into the shot with the majority of your weight on the left foot if you are shooting right handed. You may want to take a little wider stance. Do not lock your knees.

It is hard to tell, but it appears the butt of the rifle is not set properly against your shoulder.

You also need to do follow through. After you fire a shot you get your sights back on target as quickly as possible for another sight picture. Do not move your head, hand, feet or even your trigger finger until after your sights are back on the target for another sight picture. A lot of people have a tendency to more their head or lower the firearm to see where they hit. Many also are quick to move their trigger finger which is not good (part of trigger control and can affect follow through). These actions move the muzzle unnecessarily and inconsistently which destroys accuracy.

You should not have to move your head when you chamber another round.

I would suggest you look at taking the NRA Basic Rifle Course. I would also suggest looking at purchasing a bolt action rifle in .22 Long Rifle so you can practice your form (never dry fire a rimfire firearm). Savage makes some decent bolt action rifles in .22 Long Rifle. You will eventually save the cost of the .22LR rile with your ammo savings.