The Zombies Are Gonna Get Me

I am finally starting to train for Run For Your Lives. Went out this morning for my first workout and tried to follow the Couch to 5K format. For the first week of workouts, you warm up with brisk walking then you alternate between jogging and walking for 20 minutes.  My sister went out with me and things started off well but I may have to approach training differently as I still seem to have asthma that only ever acts up when I do something strenuous as running. I had to use an inhaler back in junior high when I did cross country running and I may get one now.  As a result I didn't do as well as I wanted this morning - I think I ended up walking about 2/3 but I tried to alternate as much as I could. I do love my running shoes though.
I need to figure out when I go out to jog. I got up later than I wanted today, so the sun was higher up (I think it was 11 when we started).  Since I work in the mornings, I don't want to go out when I get home at 4 but I'm not sure if jogging at 8 at night is that good of an idea as well. I'm also going to try out my mom's rowing machine on the days I don't jog. 

Any tips or ideas on training or nutrition are much appreciated.