Do yourself a favor and create the restore CDs. Once you do this just go to town and explore your new toy. You won't break it and a good way to learn is to just sit down and play. If you want I can get you some 'follow the leader's type product that you can use to help you learn.
Many years ago (1995) I bought my first computer. It had windows 95 on it and from day one I had nothing but problems with it. It kept shutting down with weird error messages. I spent 73 hours (I got my phone bill) with tech support clicking on everything under the sun. It turned out to be a hardware issue and the computer needed to be exchanged but I learned a lot.
I later got my Microsoft Certs and had my career in computers. But I knew nothing until I just played around with it.
You won't break it and worst case scenario is you restore windows. Just dive in