Fabric Compute and Storage Cost

Hi , it is bit u clear on the cost of using fabric work load. Any light on this topic will be very much appreciated. 

Scenario- We already have power BI premium capacity provisioned and I would like to understand where I would incur more cost.

If I use Dataflow Gen 1 will I be charged extra for compute and storage ?

If I use Dataflow Gen 2 without any data designation will I be charged for compute ?

IF I use Dataflow Gen2 with data designation as lakehouse will I be charged for compute and storage 

If I use Data factory will i be charged ?

If I use Data warehouse will I be charged?

If I use Data Engineering Spark engine,, will I be charged?

Is there any free amount of storage allowed in onelake for premium capacity?

Regards