I gotta disagree with most posts here. For your first semester I think you should be at pretty much the minimum number of hours you can take in courses that you can't possibly fail. Maths and Sciences are bad. I'm not saying that you won't eventually, if you budget your time, have plenty of time for a social life along with your premed work, but your first semester I think that the social side of things is going to be somewhat more time consuming than it's every going to be again.
The key thing here is that you're going to be experimenting alot with your social life. Different clubs and teams, the constantly rotating group of friends/girlfriends in your freshman dorm, learning how to drink without dying, and of course there's the option of pledging. Once you get free of the first semester you'll probably have settled down into a comfortable routine with a pretty set group of friends and activities, and will be able to split your time evenly between meeting people and getting your work done. Until then, though, I'd recommend minimizing the work.
Is there some reason that you would want to take Orgo your freshman semester? Is this going to impact your graduation timeline?