Tuition is a big part, I would first look at schools in-state, due to the fact that in-state tuition is probaly lower. However, there are schools that are out of state whose tuition is lower, you maybe want to look at schools within a reasonable distance from where you are located. After selecting a few schools that fit you, you may want to contact the recruiting coordinator or someone on the coaching staff that handles recruiting in your area or region. Next, you should send what film you have or game tape to the school and find out based on your grades, do you qualify to attend the school.
If everything goes well and the coaches like what they see or want to take a chance, they'll be in contact with you and take you thought the process of getting into the school. Also, Division 2 and Division 3 football isn't no joke, we have standards, we expect the best out each player on and off the field, so start doing a little extra at your school (hit the weight room, watch more film - become smart on the field, etc...) so that the next time you talk to K-Mack, you can say I am good player and not a average player, because many players on Division 2 or Division 3 rosters were either captains, starters, or players who seen a lot a time on the field while in high school and was maybe overlooked by bigger schools. Moreover, don't give up on you dream, keep working hard each day to get better and don't settle for anything but the best for you for the future, either for football or life in general.