I'd like to hear other's walk on stories as I am sure each is different.
I mostly sprinted in high school and ran 50.2 but also ran 2:02 and figured the 800 would be my event in college.
I never talked to a college coach while in high school.
I registered to go to college at George Mason which was close to where I lived.
I didn't bother talking to anyone before school started and finally looked into it in early September.
I found the sprint coach before practice and he said I had to get a physical first (I missed the school physicals so I had to get one on my own).
I then talked to the distance coach, Cook, and he also told me to get a physical. When I told him I had one he said to jump in with the sprinters the next day since cross country was already in season (and I didn't have much distance base to hang with them).
So I did that and ran the whole school year with them racing 400's and 800's (ran 1:55.8).
2nd year I had knee surgery in the summer and again didn't do cross country by I joined Cook's group for training mid fall. Ran 1:53.5 sophmore year and 4:05 1500m.
3rd year improved to 1:50.7 / 3:54.6
Received partial scholarship (1/4) senior year and ran 1:49.7 and 3:52.4.
Had 5th year indoor eligibilty and had final semester full scholarship. Qualified for NC's in 4X800.
Ran 3:42.9 outdoors unnattached.
Hit 3:42.1 three years later to run USATF.
Mason was not much of a cross country school but very good at 400m, 800m and the jumps and hit top 3 at NCAA team scoring a few times.
They let anyone walk on and practice and had enough home and local meets for walk ons to compete.
Maybe cross country focused teams with big numbers of runners have a different view to letting anyone run with them.
(There was no email in my day)