No, you don't sound really dumb. You sound like someone who is interested in trying out Linux for the first time, and that's a good thing. I will give you a few recommendations, and you can choose what you want to do from there. The very first thing I recommend you do is try out what is called a live CD, or, in other words, a Linux distribution that you can try out without having to install anything at all.
One of, if not the, most widely known live CDs is Knoppix, found at
http://www.knoppix.org/ . You can click the American/English flag at the top of the page to get it to display in English. You can then click on "Download". I clicked on the [http] link for ecn.purdue.edu near the bottom of the list. Click on "Accept", and then click on "KNOPPIX_V4.0.2CD-2005-09-23-EN.iso". Save it somewhere on your hard drive.
The next part depends on what operating system you are running. I'm going to guess you're running Windows. I'm not sure exactly how to do this in Windows, but there is a way you can check to make sure the ISO file you have was downloaded successfully. On the page where you clicked on "KNOPPIX_V4.0.2CD-2005-09-23-EN.iso", you should be able to find "KNOPPIX_V4.0.2CD-2005-09-23-EN.iso.md5" directly below the link to the ISO file. As of this post, that link said
Code:
1188f67d48c9f11afb8572977ef74c5e *KNOPPIX_V4.0.2CD-2005-09-23-EN.iso
What this means is that if you run the command "md5sum" on the iso file, which in Linux would look like
Code:
md5sum KNOPPIX_V4.0.2CD-2005-09-23-EN.iso
in the terminal, the command should print the 1188f6... number to the screen. If the number matches what is shown on the Knoppix website, then your ISO file downloaded successfully. If the numbers don't match, delete the ISO file you downloaded and try again. You may be able to search Google for "md5sum Windows" or some such thing to get an idea for how you can perform this command in Windows.
Once you have a complete ISO file on your hard drive, the next step is to burn it to CD. Almost all CD burning software in Windows have the option to burn a CD image. This is what you want. The ISO file is an image of a CD, and you need to tell your software to burn a CD image with this file. Among other things, this will make the CD bootable.
After you have burned the CD, you can place it in your CD-ROM drive and restart your computer. If your computer is set to boot off the CD-ROM, then you will soon be presented with a Knoppix screen. You can hit F2 or F3 to get some help about the various boot options, but you can also just hit enter and accept the default setup. Very soon you will be staring at a Linux distribution without having to install anything on your hard drive, because your CD-ROM drive and your system memory are the only tools at work.
That is a relatively easy way to try out a Linux distribution without messing with your computer as it stands now. Once you get comfortable playing around a bit in Linux, you can download ISO files for each of the installation CDs for Fedora Core. When you get to that point, either hunt around the web for documentation or come back and post here.