Identify NCAA Division-3 schools you are interested in attending. Research as much as possible to learn about the campus and playing opportunity that may exist at these schools. Identify a top choice, but also have a fallback plan in case things fall through.
Fill out a Permission to Contact form and turn it into your NAIA school's athletic director. You can send your information to as many schools as you want, but until this form is filled out, an interested NCAA Division-3 school cannot contact you. The form gives D-3 schools 14 days to inform you of the opportunity at that university.
Wait for Division-3 schools to contact you or get in touch directly with the coach of your sport at the school. The coach will express his level of interest in you joining the team. Learn about the opportunity at the school, both athletically and academically.
Decide on the school you want to attend and fill out an application. Pay attention to the school's application filing dates. Inform the coach of your new school immediately so you can be alerted about team developments.