Lori do i need to break in the cam only if its a NEW new cam? What if its just a new cam for that particular head.. but the cam itself is used?

These replies have made me think of another question.. Oil changes. Im not at all worried about wasting oil or the cost of it. So how often should I change it during break in? Ive heard to fire up the engine let it run for like 5-10 min then change the oil (to get anyhting BIG from the buildup out). Then run it 100 miles change then 500-1000 change then go on as normal.