Suggestion: Stay off the scale for awhile (see a previous thread on losing weight)

If you start riding and walking you probably will lose weight eventually but it takes awhile to get the metabolism reved again and you are going to be developing muscle which weighs more than fat so the scale can be depressing and hard to see progress

Instead grin and bear taking some measurements They are a way better indicator than the scale. And try on some pants and a shirt that are a little (not a lot) snug, try them again in a month BEFORE stepping on the scale

MOST of ALL just start and keep us posted