this is sort of a speed and coordination builder that Ive been using for a while:

E------------------------------------------------------------------
B----------------------------------------------------------------8-
G-------------------------------------7-----7-9---7-9-11-7-9-11--
D----------7-----7-9---7-9-10-7-9-10----9-10----10---------------
A---7-9-10--9-10----10--------------------------------------------
E------------------------------------------------------------------

it helps alot. Just play it over and over and over again. Once you can play it pretty fast and accurately, you should make your own.