Many small to medium-size accounting firms, as well as very busy sole proprietors, will know about bookkeepers or 'technicians' that can implement a system for you or come in periodically to do the required bookkeeping. Ask them for a referral.
Also, there are some small sole proprietors (accountants) that can do the bookkeeping too at an appropriately, reduced rate, assuming they aren't overloaded with business advisory, financial statement and tax preparation work.
Lastly, there are a few small outfits that put out a shingle outside their home or rent a small office that you might see near your neighborhood, which you can make your own inquiries.
