Depends on you goal, Gretchen. Are you aiming for long rides, races, or long fast rides? Or all of the above?
If you want distance, you need some endurance training, to go fast, you need to push yourself to higher efforts. To do both, you need a combination.
Once you have some good base miles in (say 500) you can begin to push yourself more. You need the base to get muscle, tendons, lungs, ready for harder work. Since you had surgery not long ago (that was you, right?) you probably need to make sure you are recovered from that before you put lots of extra effort on the bike.
I take two days a week that I really work hard on the bike. I either go out with a fast group and work to stay with them or else I go out on my own and do hill work or intervals. I get in at least one longer ride each weekend, 60-70 miles or longer. I try and do one easy ride on whatever day it works out best. Sometimes I'll do a social ride with the bike club. I ride as much as I can. Not mornings, 'cause I work pretty early. But that means I get off early so sometimes I go right after work. If I go in the evening, I always have lights with me so I don't have to cut my ride short if it gets dark. Sometimes I think I'd like to live on my bike, but the real world just keeps interfering!
Of all the bike quotes I've ever read, I still think I like Eddy Merx's best. It's short, simple and to the point. "Ride lots."
annie
Time is a companion that goes with us on a journey. It reminds us to cherish each moment, because it will never come again. What we leave behind is not as important as how we have lived." Captain Jean Luc Picard