For spinnerbait fishing I Recommend one of 2 setups depending on the situation. For close-range accurate casting around docks laydowns etc. I’d get a shorter 6’0″ or 6’6″ trigger rod in either a medium or medium heavy action (I use a 6’6″ medium) I’d reccomend 12-14# line. A lot of people choose the even shorter pistol grip style rods for this purpose, but unless you can cast with both hands its almost impossible to hit the “backhand” angles with the pistol grip where it is much more reasonable with the trigger.
The second setup I reccommend is for either burning spinnerbaits in clear water for smallmouths or slow rolling heavy ledgebuster type spinnerbaits in deep water. For that I recommend a 7’0″ or 7’6″ medium heavy rod for extra casting distance and to be able handle lures that weigh from 3/4 to 1 1/2 oz. For line on this setup I reccommend 15-20# line and I recommend a fluorocarbon line instead of mono for reduced stretch when setting the hook at the end of a long cast. Since you are a musky fisherman I’m guessing you may already have a rod that handles these lures.
For crankbaits (also jerkbaits & topwaters) a 6’6″ medium that you use for close range spinnerbaiting should serve here as well, 10-14 lb mono. For plastics the 7’0″ med. heavy should handle for pitching/casting texas rigged plastics, jig & plastic, or dragging a carolina rig. For any of the the finesse plastic techniques i.e. wacky/weightless, mojo, dropshot, tube jigs etc I recommend spinning tackle a 6’6″ medium rod and reel with a fairly large spool.