You can follow many different plans on SW, Origional, Green, Mix2Max, Sucess Express, Extra Easy, it's just one of the plans. When you get your pack in class there is a booklet on it.
Mix2Max is a plan where you vary each meal, origional or green, so you could have a green brekkie, origional lunch, green tea plus all your healty extras and syns. To be honest it best to get to grips with the basic plan before you try Mix2Max. I do alot of Mix2Max and I post my food diary, so if you want to see what it looks like in meal terms, take a peek!