I have recently played multiplayer online and I downloaded and played a map called "NonRush Forest". I have also downloaded something called riverland. They have both shown up on Single Player Random map so I also play against the computer. I want to make my own maps and also put them in Single Player Random Map. Aom Heaven didn't describe it probably. So I ask anyone to help please if you know how.
To create random maps you need to learn random map scripting (coding). You can create your own single player scenarios using the game's scenario editor but these cannot be coverted to random maps.
There are a couple of guide available here. I've never tried rm scripting so I'm afraid I wont be able to help you out much if you get stuck. If you have any questions you could always try the AOMHeaven forums.