I ended up not doing anything. I cut the boards to the length I needed, stacked in two stacks of 3 and 4. Then I taped them tightly together and clamped them to my workbench for overnight. Once, I did my cutting they pretty much flattened out and by the time I got to gluing them together and clamping, they are quite flat. I should not have been worried knowing how they would be cut and glued. Experience,,,I need more experience.