How exactly does a collaborative care model work?

My pcp works within a hospital system, and I reached out for a referral to a mental health professional of some kind and was referred to this program. From the description it’s kind of hard to understand fully - I’m not sure who exactly I’ll be meeting with? I only went this route because it so hard to find any experts who take my insurance, and I cannot pay out of pocket for a therapist.

It seems like I have a “team” comprised of the care manager, my pcp, and a consulting psychiatrist, but I guess I’m not fully understanding who I’ll be meeting with? And who’ll be making diagnoses? If I happen to have something they aren’t well versed in do the refer my to a specialist or something? idk why, it just seems to be overcomplicated.