wooden golf tees also work great for this. Just stick one in a tube of wood glue, shove it in the hole until it won't go further, then snap it off and file down what's left.
So on these one would put epoxy in the current hole then fill with wood and then rescrew in? Also suggestions for said epoxy? Not a handy person.
Go get a little thing of 2-part epoxy from the local big box store. Something like this: The concept is that you mix some of that up well, then fill the holes with it. (Don't just squirt it into the holes... mix it up on a scrap piece of cardboard or something to get the 2 parts well mixed). Once you have the holes pretty well filled, then jam in the wood you choose (toothpicks, golf tees, etc). Clean up the overfill of epoxy. Let the epoxy dry up, then clean up the extra wood that is sticking out of the holes. Use a utility knife or small chisel. This now fills the hole with some solid material (the wood) that is well supported by the epoxy, and you should be able to screw the screws back in much more solid than before.