Friel (in the training bible) recommends you "Just Ride Along" in your first year on the bike. Don't focus on training, just ride your bike.

That being said, the longer rides will benefit you more at this point, since the thing you need to do the most is build your base mileage. Basically, figure out how much time you have to ride each week. Then figure out how hard you can ride for that amount of time, and still finish the week, and the next week, and the next week, etc. Fourth week you could do recovery, but that's really getting into more advanced training methods, I wouldn't worry about it right now.

Basically, just ride.