Gst filing

pls tell me in gst how to efiling and what are the annexures to efile in gst 

GSTR 1 ( fill all the details of outward supplies viz ----B2B / B2C / INterstate/Export/) all about the sales and supplies

GSTR 2 ( your seller will fill this detail and needs your confirmation for input credit )

GSTR 3 ( auto populated by the GSTN website - sum up of input and output - net challan will be prepared and payment to be made

for July - GSTR 3B shall be worked out for making payment in August