Choose an activity or activities (so that you can vary them) that you will enjoy. Walking is aways good and has the advantage that apart from shoes/boots it doesn't cost anything. You could get a pedometer which might motivate you to go a bit further to beat your record ( 10,000 steps is actually a long way!) You can also map your routes on the internet and log how far you've been. If you want to run, there's a good program on the internet called from couch potato to 5km...but do make sure that you get good running shoes as its no good getting a new found enthusiasm dashed by an injury.
But how about swimming, gardening, gentle circuit training, cycling to the shops, buying a wifit(great fun), If you have a partner(or even if you haven't) dancing from folk to jive, you could take up golf..... even energetic hoovering is good!
I've just noticed Hanas remark about blood sugar, she's right and if you levels are above 15 you should be quite careful about exercising until they are down below this.
WIth any exercise you will need to test before, during and after to see what affect it has on your levels. You may need to lower your insulin at the meal before and/or take some glucose during exercise to avoid hypos.
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