You might want to get a little tighter groups at the range, because they will get bigger when you're under the stress of the timer. Also, I was surprised when I did my first (and only USPSA match) I do 90% of my practice at 7 yds. and out of the 5 courses I shot 2 of them were at twice that distance.
You'll also want to practice changing magazines, especially tactical reloads (change mag before 1st mag is empty) as that will make or brake your time. You have a lot more time to concentrate on accurate shooting if you're not wasting precious seconds clearing taping mags that you didn't get in all the way the first time.
Above all, have fun and JUST DO IT! Even the worst shooter there has a blast, and no one will try to make you look like a fool. In fact, they go out of their way to 'cater' to the new shooter/competitor.