1. Yes become ur turnover of service Cover under limits define by Govt.
2. Only PAN is mandatory and GST no.is not mandatory. Condition your Turnover Does not exceeds 20 lakhs during FY 20-21.
3.Yes you need Munciple license From munciple before starting any business either on your own property or Rented Property with NOC
4. You Dont need to file ITR if Income below 2.5 lakhs
5. ITR is mandatory for you if registering Under Udyogand for very First year of ur business you can self declare your turn over to Get registration.