Here you go, read this and follow the formula to help you out with cutting (or even bulking)
http://www.discussbodybuilding.com/Calculate_Expenditure_A_starting_point_for_all_diets/m_6526/tm.htm Been folowing that myself for 5 weeks now and im down 10lb's.
you can continue to take creatine if you want, some people cycle when they cut. some dont. It's really up to you. But you want to continue to take your protein shakes before/after your workouts.