Hi,
Dont have time right now to answer all your questions, but on the subject of lambing kit, we have always managed with the following:
Iodine spray, Obstretic lubricant, latex gloves, lambing rope, good light or torch, uteri support and maybe a bottle and some colestrum in case they dont feed straight away + maybe some form of lamb tonic for weekly lambs + an old towell (to clean yourself and the lamb)
Would keep them in and seperate them in the shelter with a hurdle or pallets.
Foxes could well be a problem for newborns.
Look for a nose and two front feet, if you see them then you should be ok, after the ewe starts to display a "Bag" keep a good watch on her, if she is having difficulties or it is taking too long, or lamb is presented wrong, then lube up and in you go....
Good Luck