Oh I'm so glad we could enable you into stamping. LOL You know, enabling is what we do best around here. I'm not sure about websites, as I'm such a hands-on learner. IMO, your best starting purchases would be good inks, good stamp cleaner, a good stamp scrubber (I'm with Melissa on the SU one...I used to have a cheapy one from Michaels or HL, but once I used the SU one, the cheapy one got tossed), and either an alphabet stamp set, or a couple decorative background-type sets. That gives you a basic start. For embossing, you'll need embossing powder, a heat tool, and a Versamark pad. You can also heat emboss using pigment based inks and embossing powder...really cool if you use a colored pigment ink and clear embossing powder. I do a lot of stamping in my scrapping, especially with alphabets or stamping my own backgrounds. I prefer the wood mounted stamps, but that's my personal opinion.
A book you might look at is "Creative Stamping for Scrapbokers". It's got step by step project and techniques for stamping on LOs.
Hope that gives you a good start!