Transitioning from a player to a GM
So now I'm at college, and nobody in my dorm has run any sorts of tabletops, so I thought I'd give it a go. Right now I'm deciding between 3.5, Legend, and Exalted, but I was just wondering how to DM, basically? In the past, I've had two types, one that prepares everything and has an awesome story to tell, with lots of planned out options based on how he thinks we'll react to his scenarios, and one that improvised everything (everything). They all had a lot of experience, so I guess they knew what worked for them, but as a starting out DM should I plan a lot or a little?