[MENTION=433133]APBurner[/MENTION] Welcome! You are on the right path. A hybrid will do you great, a Trek 7.2 or Giant Escape or etc. Spring is a good season to start too.
If you are pretty big, you might want to know we have another subforum for people over 200 lb, some of it is just for big people problems like strong wheels and xxl bike frames, and some of it is about weight loss
Clydesdales/Athenas (200+ lb / 91+ kg)
There is also a training & nutrition subforum but it's less about weight loss per se and more about athletic conditioning