Check with Green Turtle marina on Cumberland Lake for chart books. They make a good stop with a courtesy car. I think they are the first fuel after Hoppies.
Most advise to skip by the lock at Kentucky Lake/Tennessee River, off the Ohio. The lock tenders make things difficult for pleasure craft, they want that for the barges. Go further up to the Cumberland River and then you can cross back to Kentucky Lake/Tennessee River after you lock up into Lake Cumberland.