I honestly agree with AQT. Try and make a map with already existing props if you need to ask this many questions for such a simple thing. Get the hang of the absolute basics before you try this, and follow the advice of people from other topics, as it'll likely come in handy for whatever you try and do.

OK you got me I will try this another time

I don't think so as it's a Common .msh. You could put it in just to be safe though.

If you can't find it look in Assets/Sides/Common/Msh.