How to make a pattern myself?

:??can anyone teach me how to make a pattern?
my bf is a HUGE liverpool fans!
im thinking of making him a blanket with the liverpool logo!

can anyone teach me?

These threads are currently discussing similar topic. Might get some ideas there.
http://www.knittinghelp.com/knitting/forum/showthread.php?t=63099
http://www.knittinghelp.com/knitting/forum/showthread.php?t=63214
http://www.knittinghelp.com/knitting/forum/showthread.php?t=63224