Your question could really take hours to answer so what I would suggest is to buy Brian's book, buy Matt Burkett's video's and look around this forum. Go to tips for improvements and you will find alot of helpfull information.
Oh yea either start reloading or buy lots of bullets. Because no matter how much you read and how many videos you watch it cannot take the place of putting lead down range.
I know this is not the magical answer but it will help.