Take and pass the GED tests.
Enroll in your local community college for some general education courses, such as English composition and math. These will most likely be required at your college of choice, but there are no entrance requirements for a community college. Evening and weekend classes are often available.
Sign up for the ACT and/or SAT college entrance exams. There are study courses for these exams to help you get the highest score possible. It is in your best interest to take at least one of these.
It is also in your best interest to take both college entrance exams. It shows you are serious about going to college.
Choose a couple of colleges that you would like to attend, and if possible, visit in person.
Check the college's entrance requirements and make sure you have achieved those goals before applying.
Apply to two or three colleges and wait for the results.