Hi Gavin
Just wanted to chip in here if I may.
Without question I would concentrate 90% of your marketing efforts online.
Make sure you have a marketing plan and budget in place before you start doing anything or speaking to anyone.
There are some great ways to market yourself online and most of them you can do for the cost of your time or pay someone else to do them quite cheaply for you. Here is what I would recommend for you:
A website: You will need a website to showcase some of your work. You can do this yourself using a template and customise it yourself, or get someone else to customise it.
Email Marketing: Whenever you set up your website, have an email capture system in place and offer prospective subscribers to your site something of value in exchange for their email address. I would recommend
Aweber as a service for this.
Video Marketing: Get a video put together of some of your work, put some music in the background and have a link to your website inside the video. Very easy to do with software like Camtasia Studio or a free tool like Animoto (you can make a 30 second video for free). The post your video with links etc to Youtube and other video sharing sites, it's surprising how much traffic you can get through youtube. Check out this video I made
Power of Binaural Beats A Blog: I would say this is a must nowadays, not only to get you known but because Google loves wordpress blogs and you will be ranked very quickly with any post you make. You can outsource the writing to someone else if you don't want to do it yourself, someplace to look would be
www.elance.com Social Media Marketing: There are too many sites to mention here but the main ones would be to get a Facebook, Twitter, and Stumbleupon account and use sites like hubpages, squiddo, blogger, wordpress for linking back to your main site.
This may all seem like a lot of hard work but as I said you can outsource it all for a few hundred pounds per month plus set up fees etc. Or you can spend a few weeks getting to learn everything above and then spending a few hours per week working on your marketing.
I would say you will get great results from online marketing and all of it is measureable. You will be able to track your ROI much better than putting an ad in Yellow Pages or your Local papers and it will be a hell of a lot cheaper.
Hope this helps
Steve