This video covers the Taming the Beast quest chain from the point just right before Thotar will give you a taming Rod for the Dire Mottled Boar in Razor Hill. Thotar will give you a series of three taming rods, each one differs and enables you tame beasts in the next order: Dire Mottled Boar, Surf Crawler and this contact form finally an Armored Scorpid.

After getting completed the taming Component of the Quest chain, you need to head to Orgrimmar and talk to Ormak Grimshot within the Valley of Honor so as to unlock your companion pet handling abilities: Tame Beast; Feed Pet; Revive Pet; and Beast Training.

Eventually, don't forget to visit the Pet Trainer and grab the Pet skills that you must give to your pet.