Can anyone suggest to me how to manage sales records easily in a small business?

No Matter for small business or large size business. You can use one of easy marketing automation software for any size of business. It helps to maintain your sales record. It also known as customer management tools or CRM tools, it helps to save your time. Many of the business owners use this tool.

There are a number os free sales and inventory databases available on the web Most are in MS access format. If you use the MS office suite them these are ready made to help you - They can be adapte slightly to personalise to your business. You can also purchase many that are CRM versions. However, thye came at a cost as do bespoke versions of a sales and Inventory applications. Other pacages tha have "back end functions are SAGE. This can be used for accounts and tie in to their sales and inventry addons - at a cost of course