The Practice of System and Network Administration, Second Edition
Well I'll be the first one to give you generic information that you could have found with the search function.
You just do the needful.
Good screwdriver set.
A network tone tester in case you need to map out your network and document everything. Also functions as a basic cable tester.
A punch down tool.
An ethernet crimper.
A quick cable stripper.
A usb hard drive dock.
Your necessities may vary, this applies to more of a one-man shop, and there's plenty of other things you'll want to get that I don't have listed here depending on your job.
I dunno how much you should get paid.
There's no such thing as an "ESXi book" any more than there is a book about the windows calculator. It's a fairly small part of the vmware vsphere environment.
You can start with this platform independent book:
Thomas Limoncelli's book is pretty highly regarded: https://toptalkedbooks.com/amzn/0321492668
I personally created this Poster a while back... feel free to use it: https://www.reddit.com/r/computertechs/comments/1qhcsa/poster_troubleshooting_in_black_and_white/