I'm about as new to the SS world as you are. I don't really want to gain weight because rock climbing is a strength to weight ratio sport. I want to be stronger and gaining a bit of weight is probably ok. I weigh myself in the morning every day I exercise. I've gained 4 pounds in 6 weeks but I was sick for a week before that so some of that gain may just be rehydration and getting back to regular weight.
From what I've been reading and seen in video clips, people who want to get stronger but not gain weight need to be more patient because it will take longer than someone on GOMAD.
See also
http://startingstrength.com/index.ph...class_athletes