MRC sound Box question

hey guys

I got around to hooking up my sound box and have a question? On a real loco what is the procedure to start moving? Is it let the brake go and put it into gear and go?

can anybody tell me what is first to do?

the sounds on the box are:

-bell,horn,sand,air pump,air,gear,brake release.

anybody that has a idea of what is the prototypical way to start up would be apprceiated:

Jeremy