Has anyone worked with ShipBob 3PL?

[hupovoy]

If yes, could you answer the next few questions?

1) How did you set up the rate in Shipping and delivery Settings in Shopify?
2) How did you set up Shopify zones within USA?
3) How did you configure in Shopify checkout the choice between Standart Shipbob and 2-day Shipbob shipping?
4) Is it possible to offer free delivery when working with ShipBob and how do I set it up in Shopify?