No worries. After all you have to ask in order to learn.
The only way to be completely sure that everything is working fine, is to disconnect all the drives from your computer except for the new one (which you've used for the clone). Start your computer and if it boots properly to Windows and everything seems to be OK, then it should be safe to format your old drive so that you can make a new partition for secondary storage.
If you've cloned the whole drive, then yes, each partition along with the data should be on the clone just as it was on your original (the source HDD) drive and that includes the OS (operating system, which is Windows in your case) as well. From what I see, you've completely cloned your entire drive.