What exactly should I do before and after using a facial mask?

Specific details very much welcome.What exactly should I do before and after using a facial mask?
before using a face mask i use a facial cleansing scrub which gets rid of dead or rough skin and smoothes the skin! then i apply my face mask and i always leave it on slightly longer than the reccomended time. when you have done with the face mask apply some moisturisor! your skin will be soft and your complxion will look glossy n fresh!What exactly should I do before and after using a facial mask?
Once u r done with the mask dont forget using a tonic specially formulated for ur skin type (oily, dry or normal) The tonic serves to close ur pores.