I just re-recorded that big pop at the beginning and re-uploaded. Hopefully that should fix things and sorry for the pop scare! Thanks again for the helpful advice and feedback.
If you don't have anything against it, I would recommend Audacity for doing voiceover work. It is free, the interface is a little simpler, it comes with plugins that can help you clean up your audio and add effects if needed. (Don't overdo it though as that is a surefire way to make the audio sound amateur, just clean record, remove pops and clicks, light compression and a little barely noticeable reverb is more than enough for a book or story reading)