Once you have chosen the colleges or universities that interest you, it is time to begin the application process. Visit each school's Web site or contact their admissions office to get information about the school's application process.
Many schools have a spring application deadline for fall admission. You will have to submit everything no later than March if you want to attend college in September. Check with the school you're interested in for exact deadlines. They're usually on the school's Web site, or call the office of admissions.