Oolite Bulletins

Hi i think this game looks amazing and it's for mac and all (wow) but i dont understand it at all... i dont even know how to land on planets once i finnaly reached a planet but i crashed into it! help

Hi there.
You can't actually land on the planets, and so that is why you crashed into it

You have to dock at a space station found near the planets.

There is an introductory tutorial here: -
http://oolite.aegidian.org/tutorial/

and also, tonnes of useful info here: -
http://wiki.alioth.net/index.php/Oolite_Main_Page

Have fun

You should also read Elite - The Dark Wheel, a novella included with the original game.