Talk to your Accountant.
Firstly, because they will have to be able to work with whatever software you chose to use. If you chose Software that they are not familiar with, they will do their best, but your Fees will rise.
Secondly, consider outsourcing some, or even all, of the Accounting Functions. For example, the Wages/Salary Function needs an expert to make the best use and to navigate the Legal System but it is unlikely that you will generate sufficient work to make employing an expert, feasible. Your Accountant may have it's own Department that does this for others. My Accountants were a small, 3 Partner, Company and yet they were able to give me access to a team of 4 experienced personnel and all for about £65 per Staff Member per year. This included everything including the production of P45s, P60s, NI and all Tax Matters.
That was one of the best moves I made.
You can even outsource the day to day Record Keeping, which I'm not so sure about.
However, outsourcing Invoicing can be a very useful way of spreading the load.