DO NEED TO GET THE BIG PLANING BIT OR SURFACING AND GO OVER SPOIL BOARD MAKE SURE THAT IT IS PERFECTLY LEVEL IN RELATION ROUTER?

Yes, that is highly recommended for all the reasons you can imagine. Say you were doing engraving, not surfacing the spoilboard will either exhibit some areas that have no engraving at all, or areas that have engraving that is too deep. If you are cutting completely through the material, then one end may be cut all the way through but the other end will not have a complete cut, or produce onion skinning on the bottom of the workpiece.