Choose a couple of WoW Classic professions that complement your main character's choices and put them to work, too. Of course, if you're planning on actually leveling another character, all the better.
You won't have to level the character to 70, but standing them next to a bank and mailbox means you can send any excess stuff from your main character to them easily. There's no auction house in Outland either, so if you're planning on selling stuff, it might make sense to use an alt camped next to one in Azeroth. Having a second character is useful for a few reasons.
