How do I gain an animal companion?

I just started my first AD&D 2nd edition game. I’m playing a Druid. I want to gain an animal companion, but I don’t know what’s involved.

Do I need certain proficiencies like Animal Handle and Animal Training? Am I only limited to the spell Animal Friendship? And how am I going to make friends with the woodland animals like wolves, bears, and spiders? Won’t they just attack me next time they see me? I know Animal Friendship is permanent unless left alone for a week but isn’t there a way to befriend the animals near my Sacred Grove without the HD limitations of the spell?