Well, I finally sparked it up. I used the OS it came with, which installed when first starting it up. I'm amazed at how responsive this thing is for the price. I connected to the internet via WiFi, and it worked perfectly. I've got to get more used to this Raspbian, but I will, I'm sure.
Today I ordered two more 16GB micro SD cards. One for Retro Pi, the gaming OS, and one for something else, which may end up being Ubuntu MATE, since I've used MATE and like it, and I've used Ubuntu in the past, and liked it, too. Next month I plan on getting a second Pi kit to use with the Retro Pi loaded micro SD card, as I don't want to have to keep changing the cards to use what I want. That way I can have one that's dedicated to the gaming and the other that's dedicated to the regular OS.
The only problem I have is that my monitor doesn't have an HDMI port. It has a DVI port, instead. I purchased an HDMI to DVI cable, and it works, but because of the way Dell designed this monitor it is quite a challenge to attach the new cable to the DVI port on the back, as it is a VERY tight fit. The video card in my desktop, besides the two DVI ports, has a mini HDMI port, so along with the two micro SD cards I just ordered I got a mini HDMI to HDMI adapter. This way, I can connect the HDMI to DVI cable to the monitor permanently. Doing such, I can much more easily switch between using my desktop and the Raspberry Pi with the monitor. :)
I also found out that my wireless Logitech keyboard and mouse work with the Raspberry Pi. The less cables, the better.
And, of course, once I get the Retro Pi set up I'm going to connect it to my TV. SNES games on a 40" HD TV. Gotta love it!!!