They max out at 20 per year. Right now have 18 (two left the program earlier in the year). There's a lot of collaboration during 1st year. One of your first classes is basically writing short scripts for Directors to produce, in a good way. (3 page scripts that get produced during the first semester an 8 page scripts that get produced 2nd semester). That class is mixed with writers, directors and producers (though that might be changing a little).
After first year, directors are allowed to write their own, but they can choose to work for a writer. Also for their thesis, producers have to option a new script and that usually ask the writers, although some producers write their own. (by the end of first year, you'll have at least one finished script).
They are generally speaking very supportive with finding internship, since it's required. That's one of those things that got weird with COVID, cause screenwriters are supposed to do theirs over the summer (you can do it whenever, but DON'T do it first semester). Obviously that's not happening, or at least not like it's supposed to, and they haven't figured out exactly how all of that is gonna work yet, which is understandable.