do a search for " free website template" loads on the net
they are free, buy the domain name, 10 quid for 2 years, get a host ( 10 - 20 quid a year )
job done
except free website templates look crap usually. And better ones are by no means easy to customise.
I see loads of home-build websites that look totally and completely naff. In my opinion if a cutomer sees a rubbish website it actually is negative marketing.
Once again we're in the realms of the bodge it merchant versus the pro.
My advice would be to get a pro to do it. Should cost about £300-400, more if you want some flash content and it will be cash well spent and that will really add some pizzaz and look pro.
Get him to also put a "pay me" link on so customers can pay you too, and whatever you do , DONT put stoooopid google adwords all over your site, that is the worst, most tacky thing ever and will only earn you like 0.1 pence a year.