If you want to do something original like that, the best place to start is with sketches. Make a few of how you want him to look. Make a front, side, top, (and back if you want)...layer them all together and start the modeling fun. Or even better yet, if you can find some that are already done for you on the internet (like gundam blueprints).

Another great place to get motivation is buying books with tutorials, or finding free tutorials on the net. Just google "maya tutorial, organic modeling" or "maya tutorial, landscapes" and just learn everything you can.