Welcome back!
https://wow-petguide.com/
should give you all the latest strategies.
You will also find these addons very useful, available from curse.com
Rematch
Battle Pet Breed ID
Pet Tracker
Update help
I stopped playing wow the beginning of 2014 when my Moms health went down and rescuing large senior dogs went insane. I've got more time and decided to look WOW up again. Things have Changed. I went back to the 5.4 forum and eveything look the same until I noticed some small changes and I must have left before the broke the water spirit and howlbomb? So I'm more out of touch than I thought but I can't find any updated guides. I could use some info on updated sources. Who's got the new guides. Help would be greatly appreciated. I got several new pets to get to 25