The background image is 320*213. The real screen is 320*240, but you have to substract 27 px for the softkeys => 320*213 left.
There are two ways of starting with WM homescreens ... Either use "Homescreen Designer's", or do it on your own, by learning/understanding xml.
Check this post for some guidelines:
http://www.everythingq.com/forum/q-h...als-11322.html
There are links to tutorials but also links to "Homescreen Designer's".
IMO, those HS Designers are sh*t. You get better outcomes by doing it on your own.
PS: Welcome on EQ ;)