Painting a Wall, after removing the wall paper...

I'm removing wall paper from my kitchen wall. I plan to paint the walls, and then add a rail of sorts so the chairs around the kitchen table won't bump into the wall. I'm not sure what kind of paint was on the wall before my parents added the paper, but I think it might be a semi oil based paint, anyway, is there anything special I need to do to the wall, other than the usual, filling in the holes, smoothing it, making sure all the glue and paper is removed, before add a flat paint ????
I appreciate anyone's suggestions :)....thank you ;)
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