It is a mandatory requirement for businesses to register and charge VAT when their sales reach £82,000 (2014/15). It may be advantageous to voluntary register if you are under this threshold as you can (for instance) recover the VAT you have paid on purchasing goods and services. It will also give your business a more professional image.
The flat-rate scheme may be beneficial to you. There are also many other schemes available.
We can register your business and produce and submit regular quarterly VAT returns to HMRC.