You have GOT to join a local shooting league. If you have not received quality coaching, you will never be able to pick up on your mistakes. You will be making a bunch.
Try to locate a league or club that shoots the NRA Service Rifle course, and I guarantee you will be much better off for it.
You can't learn to shoot by reading a book or getting information from the 'net.
Just my $.02 worth.
God Bless America