Properitorship registration

what all registrations required for sole proprietorship ,
I heard gumsta licence was sufficent but now it is no longer in existence,instead we need to have Udyog aadhar ,
will that suffice for sole propritary person to carry on software consultancy business or any other registration are required and also they procedure please.

The Details of Business
turnover is less than 10 lacs and business is related to software consultancy and residential address is the office address
some software clients are interstate
whether any requirement to register for GST ,if so what all have to do returns after registration(like invoice,returns etc)