If this is your first M&P, READ the factory manual cover to cover first.
Then clean and lube the gun per the manual instructions BEFORE shooting. Don't overlube, and don't put oil in the trigger linkage and striker. The spot in the frame that calls for lube is the sear face that contacts the striker--just a small drop!
Dissassemble and clean the magazines (I use CRC silicone spray) and wipe DRY before reassembling.
Now you are ready to go to the range.
Load a magazine (you don't have to load it full, which will be difficult at first).
Lock the slide back using an empty magazine. Insert the loaded magazine, pull the slide back slightly, and release. KEEP FINGER OUT OF TRIGGER GUARD WHEN LOADING.
THE GUN WILL FIRE WHEN TRIGGER IS PRESSED.

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Science plus Art