to be honest it's a game that suits a controller more than mouse/keyboard
one stick for movement (movement is pressure sensitive so you can sneak up on enemies and stab them in the back) and the other for the camera/locking on & switching target when locked on, left shoulder has one button for blocking and the other for shield bash/parry depending on what type of shield you use, right shoulder buttons for normal & heavy attacks with melee weapons, the shoulder buttons are also used for firing/zooming ranged weapons or magic/miracles/pyromancies, one button for sprint/dodge, one for using quick items, one for switching between 1 handed & 2 handed grip on weapon and the other is for actions like picking items up, opening doors etc
on the d-pad left switches left hand equipment and right switches the right hand, up switches magic/miracles/pyromancies & down switches quick items, up & down also zoom in & out when zooming with a bow
it might just be me (racked up over 400 hours between demon's souls & dark souls) being used to the controls but it just seems too fiddly using a mouse & keyboard especially in the boss battles
the lack of graphics options, capped frame rate & the fact is uses GFWL are all bad decisions though and seem to me like they're taking the easy way out (don't they'd even have bothered for pc if it wasn't for the online petition) i just hope they release the extra content as dlc for the console versions