Warehousing business

hi 

i run a warehousing firm in bhiwandi  , maharashtra ... i have clients in maharashtra 

whgich type od gst will be applicable

IGST

CGST

SGST

also i want to start a warehousing operation for exports for a small firm

can i start from the same warehouses , which i have been using for domestic operations?

thanks

avinash