Book Keeping (quick books or something else?)

Like everyone here, i feel like i'm going to build the next billion dollar business.

I'm looking to work in the institutional space, so i'll be dealing with global banks, corporates, etc.

What do you recommend to help with billing, keep track of expenses, etc...

Is there a one stop shop that also does cost accounting, etc... so i can over time really measure my expenditure on projects/clients and so on?It would be great if someone also had the ability to review investment performance of projects to actually revenue.

Does such a service exist? Or you guys going to create one for me?