About to start a new job which will be an office job

Most of my life have had a career which I have been on my feet all day. Last 13 years have put a lot of weight back on. In 1995 had lost 85 pds on my own had kept it off until move to another state 13 yrs. ago. Tired off being heavy and need to get motivated again. Bought a Garmin vivofit months ago and just recently learning how to use it.