My secret weapon (s)
Cheap Harbor Freight clamp on vises. They are barely functional stock. However with a few small alterations they can work quite well. I use hard maple cauls with sand paper for better grip to make them hold to the bench better. I lined the jaws with 1/8in plywood adhered with double sided duct tape. Not going to win any awards or admiration, but these vises will do in a pinch and the pair only set me back about $35-40. I do think that getting a pair is the key to stable clamping and also for working longer boards.
For long boards you will need support in the middle. I clamp a couple of parallel clamps to the bench and put a board on top of them for additional backing. Here is my setup for cleaning up a 98in long board.
My rough lumber buddies
The scrub is my new best friend. Today was my first heavy use. I can tell we are going to get along splendidly. The scrub takes about 1/16-3/32in per swipe, but it leaves a bunch of troughs behind that need to be cleaned up. Enter the No5. I start it at 45* and smooth out the scrub marks. Then I transition to working with the grain. Then out comes the No8 to flatten. Once flat I may take a lighter pass with the No5 to smooth out any blade marks from the No8.
In the end it ends up something like this. It takes me about 30 minute to flatten a face. I hope to get faster, but it may just depend on the material needing to be removed.
From here I can go to my planer and the tablesaw to 4 square the board.
-- Doug, woodworking in Alabama