Bookkeeping - Small Firm

My firm is transitioning from being a one-man band consultancy to being a proper financial services company, though still small. We have an accountant who prepares the statutory accounts, but our bookkeeping is amateurish, and that's being kind. Our staff consists of one employee and several consultants, and we have five to seven clients for to whom we write invoices monthly. We need someone to take our ledger and our bank statements, prepare invoices, track expenses and produce what I will call management accounts, though that's probably too grand a term for what we need. Bottom line is that the books need to be done on a proper system like Quicken or Microsoft. Can you help? Thanks, look forward to hearing from you.