You need to register your company or (an LLP if you have one in mind) with ROC.
Brief steps for Pvt Ltd Co :
a. Apply for Director Identification Number ( DIN )
b. List out 6 potential names that you have in mind.
c. List / write up on business of the company.
d. Proceed to prepare MOA, AOA and proceed with incorporation using SPICe form.
e. Alternatively, you can reserve your name using step 3 and filing INC form for reservation of name and once approved go ahead with Step d.
Hope this helps.
Bala Srini FCA., LL.B.