I am a noobie looking for some help!

I have very little knowledge of web design but I am determined to give it a go! I studied a course about 6 years ago and learned a bit of HTML, however as I have not been using it I cannot remember half of what I learned.

I would like to create a web site for a friend who is starting a small business. The site needs to contain pictures of products and offer an online buying option.

I have been reading up a bit on HTML and CSS on the HTML dog site and some of it is coming back to me slowly, however has much changed in the past 6 years as there are some things which appear to be new or maybe I just cant remember?

I already have Dreamweaver and from what I have read then this should be okay to use? I am a bit unsure though as to what graphics program to use. I have not yet used any programs to design graphics, so I am looking for some advice in this area.

I hope to end up with a web site that doesnt look too amateurish. Is it possible for me to do this by just using HTML and CSS?