what is the scope for fresher to begin the career as SAP EHS Consultant?

I am Megha, an environmental engineer working in a consultancy which deals with operation & maintenance of Wastewater treatment plants. I had completed my post graduation in Environmental engineer. Now looking to change my career path as SAP EHS consultant. Kindly give some suggestions regarding :

1) What are the basic requirements to start career as SAP EHS consultant?

2) How to get approach the companies which deals with this module?

3) What exact work does a SAP EHS consultant do?

4) As a fresher can I good opportunities in this SAP EHS consultant field?