1. From October you ll be file your GSTR 1 2 and 3 returns as Quarterly return.... (In my view it's just confusing at the time of filing if you have huge no of bills)
2. You can pay your Tax liability Quarterly from October.
@ Mr Rani Raj., What is your exact query and requirement...? Amendment passed on 13th October. After the Amendment we will process our business if it's applicable to our business / profession...
If you are migrated person from previous tax Regime then you should consider your last financial year turnover
Or Else
If you are new tax payer from this financial year then you have to declare it. The declaration process of your expected turnover in this financial year is yet to be started by GSTN (expected to start from January 2018) As of now and upto December you have nothing to do except filing returns GSTR 1,2&3 from July to September and GSTR3B from July to December.