Is there anywhere that I could obtain more information about heraldry?

I'm looking for any website or service that can either create a profesional coat of arms for my family or teach me everything I need to know about creating my own. I know the basic components of what makes a coat of arms, but that's pretty much it; I have little knowlege of my family's history and without a geneoligist I haven't been able to find any hints of there being any sort of family crest for my lineage. I don't care what the source or service is: a website, book, shop, anything at all.