Your question is unanswerable because it's just to broad. It's like me asking what is the best alternator to purchase for my vehicle. You have no idea what kind of vehicle I have either. a 4 passenger car? A truck? A 10-wheel semi?
There is no tax tool for "managing" any business. The key thing is to keep good finely detailed records of every single transaction that occurs with the business for any reason - down to the penny. If you're new to this then it's best to seek professional help for at least the first year of business. This can be particularly important from the tax point of view if your state also taxes personal income.
