The number for the TC's office is 5577. I don't remember the prefix. 693 or 673 
Don't worry about the cammies. Whenever you report to a new command, do so in your dress uniform.
There is a Subway on the quarterdeck where they will sign you in, give you your badge, so you can swipe through the turnstiles. There will be guys in their blues holding their arms out, pointing, monotonically chanting "Stairs...Third Floor...Follow Signs...". Everyone will be in utilities but the new guys checking in.
0500 should be your check in time. Just kidding, I don't know what time muster is.
Okay, I've got some current information for you. First, the phone number to the TC's office 863-5577. This is a great number to call because the person that answers the phone won't think your stupid for calling...well, they will but it will be several weeks before you see them and by then they will have forgotten all about you.
Second, as for the uniform, we aren't wearing cami's yet. Just as dd mentioned, checking in wearing the dress uniform is never out of style and always your best choice. Better to be overdressed than under. The first day is all briefs. You won't be going down in the plant until you get your TLD.
Make sure you are well within grooming standards and that your uniform doesn't have summer creases...summer' here and summer' there.

I think your muster time is 0730 but call the TC's office and find out for sure.
Good luck on the 626...DW.