[g.willikers]

For developing skill, read a few books that are available at brianenos.com, in the store section.
Especially Brian's book, "Beyond the Fundamentals".
For practice at home, dry fire as much as possible, including the draw and concentrate on good trigger technique.
Airsoft is good, too, to be able to practice in ways most ranges don't allow.
Also look for indoor matches in your area, for the winter.
Having an outdoor range at home gives you a real advantage, too.
At the range, practice reloads, the tactical, the reload with retention, and the shoot it dry version.
Both from slide lock and from the gun in battery.
Also practice starting with the gun on the table, both loaded and empty.
There's lots more, of course, but hopefully these ideas will give you a start.