All we had to do was register with the dual credit office. They registered him and waived the registration fee, then they sent him to take the College Placement Test.
In order to take classes they must qualify to be in College Algebra (we used Saxon Alg. II and he qualified with no problem), qualify to take Composition I (this also didn't seem to be a problem, he qualified for Honors Comp, I used Abeka grammar in our homeschooling), and qualify in Reading Comprehension at a college level.
So now he's free to take whichever classes he chooses, up to 15 hours per semester.
We're working on the General Ed requirements, because at this point he doesn't have an inkling as to what he would want to major in.
But the way I look at it, we can get all his Gen. Ed requirements out of the way, for free!!!!