How do you paint with lacquor based paint?

yes. oil over latex. But if you want to do the reverse, you must either use oil primer first, then latex finish, or use a "liquid sander"... which more or less breaks down the oil paint, allowing the...

yes, but its very important to properly prepare the surface, clean, sand and use a primer that is specifically designed for that purpose.

Prime it first.

You can paint a floor with anything, but it doesn't mean it is a good idea. Most paint manufacturing companies make several lines of "porch & floor enamel" (see note below) specifically designed...

yes.