If I may...
http://www.bullseyepistol.com/ is a great place for information. Read that.
1. Get a coach/shooting buddy who has some knowledge in the bullseye format to help you along.
2. Excersize: low impact arobic workouts for 20-30 minutes to improve overall cardio/vascular health. Lifting 5lb weight at arms length. Hold until tired... repeat.
3. Food: Avoid high sugar high caffeen and high fat drinks and foods 2 hours before shooting. Good food: Bananas and turkey.
4. Training: go to the range with a set plan to work on something. Don't go to the range and shoot the national match course of thirty shots adn call it a day. You may not even shoot at all! Just going to the range and dry fire might be just as good as shooting a hundred rounds if that is your training goal for the day.
5. Goals: Set them. Make them realistic and achievable in a medium time period. Say 6 months. Write it down. Read it every time you think about shooting, train or shoot in a match.
6. When you go to the range, setup everything and shoot one shot. Then sit down and write every single minute detail from the time you opened up the box to the time you fired the first shot. That includes little things like getting the oil out or settign up the spotting scope. My routine has 35 items in it. Your's may be very similar. Repeat the same process every time you go to shoot. (EDIT: I mean follow the same routine... not write it down every time
7. Fundamentals:
a) Stance: find you natural point of aim.
b) Grip: Firm. Do NOT lock your elbow as thsi may lead to damage to your cartilage (tennis elbow). The majority of the tension should be in the forearm.
c) aim: iron sights - focus on the front sight. dot sight - focus on the target.
d) trigger pull: Once you have settled and sight alignment is approaching the center, start the trigger pull. It should be aggressive, firm, straight back. The trigger will affect sight alignment. You want to focus on pulling the trigger in such a way to move the sight alignment towards the center.
Breathing. Deep breath, exhale raise gun... and deep breath and partial exhale... aim... settle... trigger... bang.
Many people have trouble getting the trigger pull right. Either it's too fast and they pull the trigger after it has entered perfect sight alignment and they miss. Or they are not pulling hard enough and take too long to get the shot off. You have to find that perfect place where the trigger pull is timed perfectly with the sight alignment crossing the center. Dry fire a lot will help your sub conscious mind pull the trigger while your conscious mind is focusing on keeping the sights alligned.
Mental game: 90% of shooting precision pistol is mental. You have to believe you will shoot a ten in order to shoot tens consistently. Read "with winning in mind" by Lanny Bassham.
There is some good training documentation available on:
USA Shooting dot com
and
Brian Zins dot com
I am working on my own training workbook combining the best training methods from the USMC pistol training handbook and the documentation I found on USAShooting.com. Check out my website:
http://www.NEPistol.com. I will be putting that document on that site when I get the details worked out.