Do both! Playing Skyrim with only 1 Character is a waste!
Both sides are essentially the same in terms of gameplay, only with different virtues/morals/dialects, etc.
As for finding out which one you want to join, well, it's up to you. If you're just barely into the game I suggest waiting for a bit and finding out more about the world.
The more you travel, the more you'll know. And trust me, you couldn't avoid the stormcloaks/imperials if you tried.
Level 48 and I have got to that level by the way of misc. quests. Only completed Mage quest being I was leveling up skill levels with magic. I am a companion too. Being a Stormcloak would mean turning my back on the companions right?I haven't done any thieves stuff yet, still . I haven't went to the Brotherhood stuff yet either. I don't know how far I am into the actual game. I am torn here, I really am.