Keep your content short and clear - people don't read large blocks of text on the internet. You can increase enquries and sales by showing people the benefits of using your services or products instead of talking about yourself. 

Point out the reasons that people should use you, and why it will be better for them than using someone else. It's a tricky shift in thinking but really pays off. Emphasise your unique selling points, the benefits to the customer and use calls to action like "contact us now" with your phone number and link to your contact information.

Check your spelling and grammar, then get somebody else to check it. Mistakes will put visitors off using your services - if they are on your site do your best to convert them into customers!