To start, run whatever command python uses on your machine on minesweeperGUI.py
For example: "python minesweeperGUI.py"

Extra Credit Stuff:
Empty squares reveal adjacent squares
Bomb flagging
Variable board size
Ensures starting move is a blank tile(rather than simply not a bomb)
Clicking a tile with a number on it that has the same number of adjacent flags will reveal all non flagged tiles adjacent to it