Wecome, and congrats on that great start!
FYI, in case you cant get out to walk, there are some great videos by Leslie Sansone that is indoor walking,,,there are one and two mile workouts, as well as the frim walk one. The are really great, thats what I am using cause I cant seem to get myself to go outside and walk. But these really work up a sweat. Maybe you can borrow them from the library to see if you like them.
They are called Walk the Walk.
Well,,,gotta go do mine. Check back with ya later!