As the previous poster said a web as part of an online presence is a good thing, just don't spend too much on SEO unless you really do you due dili and are happy your going to get a decent return.
I do my site my self its basic but has a clean call to action for the customer and its top of page 1 when you search for the areas I cover. it costs me £8 per year and a bit of my time. It generates a reasonable number of new enquirers each week, enough that I'm happy with atm.