Congrats on the weight loss, and learning to ride the first time -- as an adult. That must have been strange; People say you never forget and it's true. I picked it up again myself last year, after 20+ years and was able to just hop back on (albeit not gracefully with my obese self at that time
).
I'd second cobalt123's suggestion of industrial parks until you're feeling confident with handling. I'm in the suburbs myself so I was fortunate enough to be able to get readjusted in a subdivision before getting out on busier roads.