Mike,
I assume you are still in the hospital if you haven't eaten anything yet.
You can chew gum (do not swallow it) and it has been shown to help wake up the intestines. Once the intestines wake up, they will give you liquids for a day and then soft diet and then you go home (once you have a bowel movement).
They should let you know about eating but basically you want small meals of easily digestible foods. Eat 5 or 6 times a day with little bits instead of two or three big meals.
Stay away from spicy stuff at first. Keep a log of what you do eat as you will discover some foods are better than others. You intestines will react to some foods, but it is different for everybody.
Milkshakes are good to have at home. For a while, having some higher fat items are supposed to be good but it all depends on your situation. If diabetic or something it doesn't mean the old rules don't still apply.
Glad to hear you are walking daily. Keep it up and try to increase it each day. Nothing better than walking (and chewing gum) to get things going.
Hope you have a quick recovery!
Mike