You can do it! I started out at 320lbs myself, so know where you're coming from.
Even if you only get 30 minutes on that bike the first few weeks but you feel like you'd like to do more, once you're done, maybe jump around or dance or something during commercial breaks if you watch TV, go out of your way to take the steps at work if there are any, or walk around the building during a break. Getting your body used to additional activity at the level of weight we are both at is important. Pushing too hard with the weight we are carrying can lead to injury, so start small and add time onto your exercise routines as your body gets stronger.
You're going to do great! I really feel for you and I understand where you'd coming from, and I'd be more than happy to be like, online motivator buddies

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Ok, the end of my insane ramblings lol!
Take care and good luck! Keep in touch
