From the Monte side of the lake, I believe most people use this access, they call it the Claybanks access IIRC.
I know you can get bait in Monte at Runnings, they bought the local sporting goods store in town a few years ago. Mitlyng’s near the state park is your other option, would give them a call during the week to see when they’re open.
LQP and Big Stone fish pretty similar, everything swims together in the basin. Walleyes were down a couple years ago, not sure where the population stands now; bluegills and crappies have been the main target for the last 8-10 years with eyes mixed in. Hope this helps, good luck.