In reply to Leam96climb:
I've set up a number of these in the past, from bridges and trees, during my working life (in outdoor education). More recently, I've arranged for them to be set up by professional ropes course builders. I would echo what others have said above. If you need to ask the questions you have, you may not have the experience you really need to set up something like this safely. Sorry if I'm misreading that.
Martin