Awaiting Diagnosis

Hi anyone and everyone.

I'd just like to ask a fairly open question.

So I'm awaiting a diagnosis for Autism for my child. I'd just like to ask, if we get a diagnosis what happens then?

Literally not sure on a next move as I definitely need help knowing how to cope, how to manage, I don't even know if people get medication for Autism? My child will be a young adult soon and at the moment we are being pushed from pillar to post for answers and help. 

The difficulty is I know they won't be able to go to college or work right now but no one seems to be offering anything but numbers for support groups etc. How can that even happen if my child doesn't even like talking to people let alone go out into the world of education or work.

I'm just a bit bewildered at what happens next?

Thanks in advance.