There are several followers that you can pick up throughout your Skyrim adventures, but the one that you can get very early in the game is Faendal. Faendal is located in Riverwood, which is the first town that you visit. All you need to do is side with Faendal in his love triangle quest, and he will follow you.
Once he is your follower, you can now receive training from him for Archery, up to level 50. Obviously you pay him for his services, but straight after you can choose the "I need to trade some things with you" option and retrieve all that money. I stuck with Faendal throughout my game because he was an archer, but this should work with any of the followers that offer training.
It's a nice little glitch, hopefully Bethesda don't fix it too soon.