If the unit has a large batch of newbies, usually they will have mob briefing. Its their stupidity if they don't 'cos everyone will be blur and not know what to do.
Regardless of briefing or not, you still have to report if activated. If your unit has no briefing and you have no idea what to do, its your onus to call up and ask. As you would've know by now, ignorance is not an excuse.
The standard field pack list is the same though some units may have some differences. Again, call and ask if blur.
Unless you live next door to the mob centre, common sense is to bring a proper field pack. Unless of course you don't mind spending $20 x 2 on cab fare to go back home and pick up missing items.