A list of guides with links attached, help yourself. A will edit the list if someone has anything to add or if I find something nice.
Choosing a pet: https://www.ownedcore.com/forums/world-of-warcraft/world-of-warcraft-guides/20388-hunters-guide-choosing-pet.html
Pet skills and where to get them: http://www.tentonhammer.com/guides/wow-hunter-guide-pet-skill-list-page-1
Large, comprehensive 'explanation' of everything Hunter related: http://www.gamershell.com/faqs/worldofwarcraftpctheburningcrusadehunterguide/3.3/
Generic Hunter Guide #1: http://forum.warmane.com/showthread.php?t=351516
Generic Hunter Guide #2: http://forum.warmane.com/showthread.php?t=351516
List of macros: https://wowwiki.fandom.com/wiki/Useful_macros_for_hunters?oldid=1512412
Pet skills and where to get them #2: http://web.archive.org/web/20070221051250/http://petopia.brashendeavors.net/html/articles/skills_list.shtml
PET TRAINING CALCULATOR: http://web.archive.org/web/20070226134300/http://petopia.brashendeavors.net:80/html/articles/resources/petcalc.html
It has come to my attention that the previous pet traiing calculator was outdated. So I have made updated the calculator so it's now usable for TBC.
NEW PET TRAINING CALCULATOR FOR TBC: https://ironjudgment.github.io/HunterPetCalcTBC/