We need a sticky
Question: Can I ride a bike? Are there bikes that will hold my weight? Should I get a mountain bike? Road? Hybrid?
Answer yes you can, any of the above. As for your weight, I started at 526lbs on a hybrid. Make sure you have double wall 36 spoke count rims and expect to have to fix them every once in a while if they are the ones that came with the bike.
Example: I have broke 3 spokes and had one wheel re-laced for a cost of $50.00, had to get one wheel (front) trued after dropping off of a 1" curb (don't do that if you weigh as much as I did) with a total of 600 miles and counting on my bike.
I'm sure others have similar experiences