a website on its own is just for your own vanity.
You won't get new work from it if nobody knows about it.
It is useful for people taking a look at what you're about, but you will have to personally direct them to the site either with business card, leaflet etc.
You defo should get one done, they are quite cheap these days.
If you do get one built, make sure you spend money or lots of time reading about SEO (search engine optimization).
The things you read about will help you get your site get on a higher page with Google etc.
Alternatively, you can use pay-per-click advertising, where you pay for every time a person hits your site, but your site will be listed near the top quite often. (can be expensive).