Hi Dave,
It does make a lot of difference where you put the different types of rings, as they are designed to do different jobs (sealing etc)
The top compression ring should be marked (R,T etc) and if you look closely it will be concave at the top (and shiny), the middle oil control ring has a step in it, the step should be at the bottom (piston skirt).
The oil scraper ring comes in three pieces (old ones are one piece), two thin rings and a wavy ring (technical term !), again these two thin rings should have their gaps staggered.
Also ensure that the piston ring grooves are clean and that the rings can move freely, measure the clearance with the ring in place, max 0.18mm for the top ring, 0.165mm for the second ring.
If the breather from the cam cover is blowing then your crankcases are pressured up indicating piston/barrel problems.
Cheers
Den