You may also want to make sure you keep your pace to roughly a 10min/mile. (or even a little less) when you are starting out. I would even suggest maybe an 11min/mile for the first week or so... then, as you feel comfortable, build up to 10min.
If you know you aren't going to be some record-breaking marathon runner, then the first goal should be simply finishing it. And time shouldn't really be a bother. (I'm not really worrying about it, and I used to run sub-6min miles in the Army eons ago).
The rule of thumb is... make sure you can have a conversation while running. If you are having trouble, then slow down...
The biggest problem I see is your current weight and your knees may have issues. Until you can come down a wee bit off of that weight, it'll be best to take things slowly.
I know you can do this though, if you have the drive to train to lift 500lbs, I know you can run a Marathon. whew... hats off to you there Andre.
I hope this helps.
my site: occy.net
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