There are a very few twin engine boats out there that have both props spinning in the same direction. That is the exception. Almost all twin engine boats have the props rotating in opposite directions. Most rotate the props outward. Some performance boats will rotate the props inward. The difference in rotation is usually done in the drives, though some older boats accomplished it with the engines. You will need both a left and right hand prop. The pitch will be determined by several different factors. You need to provide as much information as you can concerning your boat, the engines, the outdrives, etc.