The most important thing with any emergency descent (Real or practice), is to get the face mask on ASAP. In a bad case you may need to sort out your reading glasses next if they got blown off!
After sorting out the O2 and vis situation, just follow the AFM which does vary from type to type.
Flight idle, speed brakes if fitted and 30 to 45 degrees of bank are common actions, BUT most jet AFM's say leave the gear up.
Part of the reason for that is the risk of an overspeed jamming it down, cos it would not be good to finish up at 10K with the gear down halfway across an ocean trying to figure out if you have enough fuel left to make an alternate.