I don't fish it much but I'm sure there will be some guys who will way in and give you some tips, but if not here is a few places you can go to get some good info. Jeff Williams from FleFly has a lot info out there on you tube and at his facebook page I think Grand is his home lake.

https://www.facebook.com/FleFlyUSA/

Fishing Reports From Grand Lake Of The Cherokees|Grand Fishing Report