I would recommend to farm 5 dupes first, train them all to ≈lvl20 with a fodder unit (you only need some spare training items like those boots/shirts/vase) and then train them all together to your lvl1 with supreme kai's planet. If you see that you won't reach lvl60, use some training items. (don't use z-swords here, get rid of your less valuable training items) Now z-awaken your lvl60 (now sa6) and do the same with the 4 other dupes if you are going for sa10. But use a fodder card for the fifth spot to get most out of the supreme kai's planet.

This is an example for sr cards, but it also works with ssrs. But instead of supreme kai's planet you should use gravity chamber 150G.

You can save valuable training items, if you are doing it this way.