I am working on my very first css. Is there any program that I can load in what I have wrote so far to see how it would look?
Use your browser, you must also have an HTML file that's using your CSS too, CSS alone only displays text.
This is practical advice. Let me add just a little to it. Create a folder on your hard drive, put the stylesheet in that along with an html file that is is linked to the stylesheet. By having them in the same directory you avoid all the path issues while you are learning.