Euro- Given your knee history and size, and 10 years of inactivity, I would start out very short and gradually increase. The bigger you are the more pressure your recently repaired knee is going to have to endure. Its very good you woke up with no soreness.
Maybe start the first few weeks by running 1/2 mile every other day at around a 10 min/mile pace. Get 2 weeks under your belt and if you feel up to it start increaing your runs appx 1/2 mile with every new week until you get up to about 3 miles then only increase 10%. Find a distance and pace that works well for you. You wont want to be running the same pace all the time, nor the same distance. I would obviously avoid sprints due to your knee.
Good luck.
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