Find an accountancy firm similar to the same size as your own company. Smaller firms are more likely to provide a personalised type of service and normally charge more reasonable fees than the larger firms.
Make sure you choose a qualified one. The qualified accountants may cost you more because they have had the proper training and they regularly have to keep updated. The fully qualified will more than likely belong to any one of the existing professional bodies so you know that they are regulated and have the necessary experience and knowledge to work you. You can request to see their credentials if you have any doubts as to their qualifications.
Getting recommendations from friends or acquaintances is a good start . Searching online can really help in pinpointing the right accountancy service for you.
It’s a very good idea to meet a handful of accountants instead of jumping in and accepting the first one you meet. Make sure that the initial meeting with the one you select is free (look elsewhere if they charge). Plan well ahead and list all the things you want to know. Enquire about fees, availability and types of services and if the accountant can provide references from business clients similar to you then that should go a long way in allaying any doubts you may have.
Ask things like out how many accountants in the form, will your work be done by the same person or will it be shared, do they have a solid client base and what kinds of businesses do they deal with. Also ask why they think their firm is appropriate for your needs.
Asking what kind of returns on your investment is a very good idea because this will inform you of an approximate amount they can save you compared to what you have to pay to use the service they provide.