I need to lose weight, as I am a diabetic and Miserably unhappy...Help me please!!?

I weigh 245 lbs, male, a night owl, work nights on a physically demanding job, take a boatload of pills nightly, some for Being Bipolar, and others for Fibromyalga and The aformentioned Diabetes....I just need some good tips on simple things to do that will help me lose some of this horrific fat I have- diet tips, healthy food suggestions that are good for diabetics, etc....PLEASE, I REALLY NEED TO DO THIS TO SAVE MY LIFE....I fully intend on seeing my doctor this week regarding this and am willing to do what I have to do to make this work. I joined a gym today, and want to be able tolike myself again!! Thanks!!