can I bring a friend along with me (he is 21+, AND I ordered ahead?). or is it a one person only line? in order for him to come inside with me, would he also have to order something ahead?

Yes, in order for him to accompany you he would also have to have reserved ahead. Otherwise, they'll make him wait for you outside or in the walk in line.

There are two lines, so your friend would have to stand in a separate line. The reserve line is always much faster, so I would recommend for them to reserve it as well

He's good. A gram is 15 dollars so he can buy something small if he wants to try. Better to try weed than get drunk.

To come in at the same time, yes. If he doesn't reserve anything, he'll need to stand in a separate line.