On your planer you need a flat "reference edge" which the planer base will follow. The upper, planed surface will end up parallel to the reference edge.
Of course you should break down your boards into slightly oversized blanks for the parts you require. In this case you will maximize the available stock. So if you need 2" rails, don't start jointing/planing 6" wide and full-length boards.
Of course you should break down your boards into slightly oversized blanks for the parts you require. In this case you will maximize the available stock. So if you need 2" rails, don't start jointing/planing 6" wide and full-length boards.