Hi,
you need to find how it's done on other games, and inspire from that.
either you do a small video, or you do an ingame tutorial, that points arrows to feaures and ui elements, explaining what it does, etc etc. that's the likely best ways to go about it. external help with step by step instructions and tips will hardly get looked at, so your best bet, is inside the game as the user begins, it should have features such as dismissing the help and such.
Bye,
Jean