The best thing to do is start with the Ghost Shooter tutorial, if you are not already familiar with construct or software that operates in a similar fashion (such as MMF, MMF2, TGF, STENCYL, ETC).
A good thread in general to look at is this one:
scirra.com/forum/examples-tutorials-list_topic41594.html
Good luck, and remember... when asking for help please be specific, as there is more than one way to do things around here. The best way to get effective help is to define what you are looking at/for clearly and specifically.
~Sol