The first thing you will want to do is attach your DSLR to your computer via USB cable or remove the memory card and insert it into the memory card reader of your PC. Many DSLR cameras come with custom software used to transfer your photographs from your camera to your PC, but if you don't have that software installed there's no need to worry. Once you have your camera attached to your PC or the memory card inserted, you will want to navigate to the directory structure of your memory card. From there you can simply drag and drop your photos from the memory card to your PC.
Now that you have your photos on your PC, you are probably eager to email them to family, upload them to Facebook, burn them to CD and print them out to show your co-workers. Before you share your photos though, I would highly recommend you take a close look at them and see what problems there are with your photos and what improvements you can make (if any) using photo editing software.
There are so many different photo editing programs on the market today that you can use to make adjustments to your photos. These programs include the free options provided in the link above, as well as paid options such as Adobe Photoshop, Adobe Photoshop Elements and many more. In the end, photo editing software will not take a bad photo and make it into a great photo. What it can do though is correct some lighting problems, exposure problems and remove image noise from your photographs.
Once you are happy with your photos, you are finally ready to email them to friends and family, burn them to CD or upload them to one of the many photo sharing websites on the Internet.