The first and usually only step is to download all your data from Bit-Z and upload it into Koinly. There are a few ways you can do that:
If you want to use CSV files, you need to make sure to import your deposits/withdrawals and trades for ALL previous years !
That's all you have to do. The only other thing to be vary of is to tag your airdrops/forks so they show up as Income on your generated crypto tax reports!