General process 
”In order to be considered a “recruited prospective student-athlete” athletes must be approached by a college coach or representative about participating in that college’s athletic program. NCAA guidelines specify how and when they can be contacted. Letters, telephone calls and in-person conversations are limited to certain frequency and dates during and after junior year. The NCAA also determines when athletes can be contacted by dividing the year into four recruiting and non-recruiting periods:
1. During a contact period, recruiters may make in-person, on- or off-campus contacts and evaluations. Coaches can also write and/or phone athletes during this period.
2. During an evaluation period, they can only assess academic qualifications and playing
References:  ^ a b Renick, Jobaynn (2012). "The Use and Misuse of College Athletics". JSTOR 45 (7): 550. JSTOR 1980793. ^ a b c d e f g h i "NCAA". Recruiting. Retrieved 2012-04-18. ^ a b c d "Playing the NCAA Game". Rules for Recruitment. Retrieved 2012-04-18. ^ a b Koch, James V. (27). "A Troubles Cartal: The NCAA". JSTOR 38 (1): 138, 148. JSTOR 1190965. ^ a b c "National Letter of Intent". Retrieved 2012-04-18. ^ a b NCAA Division 1 Manuel. "The National Collegiate Athlete Association". ^ a b Letawsky, Nicole R.; Schneider, Pederson, Palmer (27). "Factors influencing the college selection process of student-athletes: are their factors similar to non-athletes". College Student Journal. Retrieved 28 March 2012. ^ Drescher, John. "Hazards, Benefits of College Sports Programs". The News & Observer. Retrieved 19 April 2012. ^ The NFL and MLB rules differ slightly. Players are not automatically eligible for the NFL Draft until the completion of their college eligibility, but can declare for the draft three years after high school. In the MLB Draft, players are automatically eligible upon high school graduation. However, if they enroll at a four-year institution, they cannot be drafted (or re-drafted) until age 21 or the end of their third year in school, whichever comes first. At that point, eligibility is once again automatic, with no need to declare.