You can start your own CA firm successfully. For this, you need to follow a strategy or business plan for it. Here is a short step by step guide that you may follow is:
Set the mission of your firm
Plan the strategy for the sectors you are going to specialise in
Plan how you will attract new clients and what you can do for it
Make a pricing module for your firm
Look out the right financing option for your firm like investors or other financial support
Now divide your whole cost into segments like expenditure on infrastructure, office space and other more. You may get financial help for this with different options of business loan for CA available in market
After finalising all the steps prepared you may get register your firm. You will be required to submit particular documents for it.
And then successfully can start your firm.
Later on you may get help from consultancies to hire staff or you can go for direct hiring as well.
Yes marketing will be the major field where you will be required to work as a good marketing for your company will definitely help you out to reach clients.