Hoping to go crappie fishing there myself. If you think you might want a guide one day call Bryce Archie at Broken Bow Lake Guide Service. I've used him on bass trips before and he has crappie trips also. The crappie structure that I look for is standing timber on the north end of the lake, in the creeks. Wish I had some good advise for you but maybe someone will jump in here and help you out. Good luck.
My wife booked a cabin up there last year for a long weekend trip. I took the boat and we killed the crappie three days in a row. We fished way up creeks in standing timber and would catch 12-15 good size fish per spot. A white/chart joker was all we used. Fish were in 15-20 feet off water holding at about 12 feet. The water was ultra clear. There is a ton of submerged timber up the creeks s be careful.