I love my machine and all the dies too. Easy to use and makes fast work of cutting multiple pieces. I started with the dies for the original 72 blocks and have added qubes along the way.
I suggest to pick a block size that you like to do first and start with those dies and the strips. The cubes offer a nice compact storage method but are limited to cutting 6 layers of that shape. I like the dies that cut multiples of the shapes.
Go to the "learn and share" section of AQ for helpful tips. There is also an app to add your dies to your inventory.