There is nothing mysterious with Qubit and GPU mining,there should be plenty Information over the web.
Except how to get an asic Miner and are they even worth it?
I mined some at the start with a mix between  30 - 200 GPUs.

GPU Miner software has Benchmark options, just let it roll and check whats best for your rigs.
e.g.:
ccminer.exe --benchmark > benchmark.txt

No access to my measurements so just 2x1050Ti to play as an example for 125$ card
1050Ti 7-8MH @ Nvidia Stock or 80% limit (Win10/378.66 and also ubuntu 375.66)
Above 9MHs if you remove limits and lightly overclock, but higher power draw makes it in-efficient.