It doesn't sound dumb at all. You have to learn somewhere.
Digi stamping is using digital images instead of a traditional stamp. there are a lot of sources for digital images like digital colouring pages, high resolution clip art, and of course, artists that create the images specifically to be used as a stamp. You can print them out from any program that will import a graphic image. Most digi stamps are in jpeg format, but quite a few also come in png. The png format is nice because it will allow you to have a transparent background. Another couple really nice things about digital stamps is that you can resize them and flip them. Once they are printed out, you can use them just as you would any traditionally stamped image. There is a lot of information in Digital Stamping threads. There's also tons of information on the websites/blogs of the online stores where you can buy digital stamps. You'll find that there are quite a few who don't accept digital stamping as "true" stamping. I'm not one of them. I love my digital stamps. I was into digital crafting before I started paper crafting, so I find them very easy to use.
Just poke around in these threads and I'm sure you'll find all the information you'll need to get you started. There is a thread that lists a lot of sources for digital stamps. One of my favourites is
Free Digital Stamps The put up links to a lot of free images. Another source I use alot I mentioned earlier is free downloadable colouring pages. There are some really nice sites - all you have to do is google free colouring pages.
Hope that helps a little. I could go on for hours, but I have to start getting ready to shut the computer down and get things organized for work tomorrow. Stupid work. Always interrupting my fun.