Most small business cease to exist within a year which is usually good for tax avoidance, therefore I would say that minimium accounting should be required - probably the easiest and most understandable would be to build you own using the most well known Spread Sheet program (which I think most people already have loaded in their PC or laptop).
Cash flow is essential to monitor and you could plot some easy to read graphs to show progress - often more revealing than a columns of figures or pages of accounts.
my personal one that i know is Microsoft excel for the spreadsheet, but then you can import that into a wide variety of software. my mother uses quickbooks which has an online option for $9.99/month which is great to get started with then you can upgrade once you get the money.
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The Quickbooks Accounting Software is best accounting software for home base and small business. Quickbooks online and Open source application software. I also use the Quickbooks accounting software.