The Team Peppermint folks have a very nice user guide and if you have never seen it before I suggest you check it out.
It will help you with the basics and has 6 chapters:
Chapter One – Download and Install
Chapter Two – An Intro to the Desktop
Chapter Three – Customizing the Desktop
Chapter Four – Installing and Removing Software
Chapter Five – Site Specific Browsers and the Ice Application
Chapter Six – Additional Reading and Resources
To highlight something from the first chapter: why do I need to check the integrity of the disk image? If after installing Peppermint 4 you find that some things are not working right, then check the integrity of the ISO, only to find out that it's not right - then you have wasted all the time installing and configuring Peppermint. It took me less than 2 minutes to check the integrity of my Peppermint 4 ISO, and fortunately there was nothing wrong with it.
Do things right from the beginning so that you don't make more work for yourself later on.