I'll second (third? fourth?) the advice above - try to read up about type 2 diabetes and insulin resistance if you can. The books you've ordered should help, this site will help, and the link Spiral gave you will help - then get on Google and get hunting (and ask questions here!)
In my opinion, your number one priority should be to remove as much "processed" carbohydrate from your diet as you can. This includes anything that man has thinkered with - so it's anything like sugar and sugar-containing foods; bread; pasta; pies; crisps; fizzy drinks; things like that. Instead, eat more real food - things that grow in the ground or hang from trees or run around or swim or fly. These foods tend to be both lower in carbs and have lower GI and GL and will help your blood sugars no end. Try to eat some meat, fish or eggs (i.e. a good source of protein) at every meal along with some veggies. And don't be scared of eating a bit of fat too.
That's a simple way to make some great changes to your diet while you read up a bit more and learn the ropes, so to speak ("simple", not "easy" - it might take some willpower!) From there you can tinker with things and see what works best for you; many people find they need to consciously lower their carb intake quite a lot to get good control, others need to be strict about eating low GI and low GL foods, some people do both.
The great thing about all this is that, although you've had some probably alarming news, you CAN make massive improvements quite quickly just by improving your diet. There are loads of stories on here from people who've done just that.
Good luck with it, do post back with more questions or to tell us how you get on.
Cheers,
Nick.