When you start any type of the new business in India, your first task is only to take the proper legal registration from government of India. so basically there are 2 type of the registration :-
a) Business Registration like incorporation of company.
b) Tax Registration like VAT/CST or Service Tax or Now it’s called GST Registration.
Tax registration are required by the business when they cross the certain turnover limits in the respective laws like GST have 20 lakh rupees turnover limit (northeast state 10 lakh). similarly sometimes you have to required the tax registration in the starting like when you want to sell on the popular ecommerce platform amazon or flipkart or snapdeal etc. so best thing is just wait till the 1st july 2017 then directly apply for the fresh GST Registration.
so ultimately following person have to wait till the 1st july 2017 to register as proprietorship firm with tax registration :-
a) who’s want to sell on e commerce marketplaces
b) whose deal in trading or manufacture.
c) who’s want to sell the products which is fall under the vat category.
d) who’s want to start import export business with tax registration.
Hope now your confusion has been cleared regarding the new business registration. so you can go with the proper incorporation procedure but yes you have to wait for the fresh gst registration.