Really, a template-based brochure-ware site built for you for a few hundred quid will be your best bet. You will spend vastly more than that in management time failing to do it yourself (or, at best, doing a worse job) - the training courses and textbooks and software will cost you more than that!
If you're short of business you should be spending your time looking for business, not faffing around trying and failing to build your own web site - that's just a displacement activity for someone who doesn't like the rejection that comes with cold calling.