Gst registration query

I am about to start with e-commerce business and have got my LLP registered in June 2017 but yet to receive trading license from MCD, I am facing following issues while registering for GST online, please help

1. I have my office in Model Town Delhi 110009, Model Town otherwise comes in North West District however when I go to https://centralexcisedelhi.nic.in/del1/juris_del1.htm website it shows Model town under North Delhi, so what should I enter my district as North Delhi or North West Delhi while registration?
2. What would be Commissionerate, Division & Range for Model Town Delhi? (Again getting confused with Commissionerate of North West and North)
3. Assessee name would LLP's name right?
4. I have just received my LLP incorporation certificate in June but haven't started with business or any trade yet what would be my date of commencement of business?
5. Am I liable to file GST Returns for July & August provided I have only registered my LLP but not started any business and I am yet to receive trading license from MCD without which I can't start my business