Directions to making my example platform game

I. searched for sprite sheet
II. searched for tile sets
III. cropped sprite sheet
IV. opened game maker
V. created character sprite
VI. created wall sprite
VII. Created object for my character
VIII. Placed event for step under character
IX. set the gravity for character under step
X. created wall object and check solid
XI. created collision with wall object under character
XII. set the vertical speed under the collision
XIII. created left keyboard event under character
XIV. set the left speed
XV. repeat steps xii and xiv for left keyboard event
XVI. created up keyboard event under my character
XVII. set vertical speed and check collision
XVIII. create room
XIX. place objects in the room
XX. test your game