import the goods using section 57 warehouse of custom act 1962 - Customs - Exim - SEZ

Hi Experts, I have a query on which need your expert advise. We need to import the goods using section 57 warehouse of Custom Act 1962 . 1. What is the procedure need to be followed. 2. Can we sell the goods from section 57 warehouse to SEZ. 3. Can we sell the goods from section 57 warehouse to section 58 warehouse. 4. Can we sell some of the goods to SEZ on Free of cost basis. Thanks