Will global warming create more clouds, that will reflect the

>will global warming create more clouds
yes

>thus cooling the planet
that's unknown, because the clouds reflect both short-wave radiation into space as well as long-wave radiation back to earth. The relative dominance between those two mechanisms is dependent on both altitude and latitudinal position and it is very uncertain which of those two will prevail in an overall increase in cloud cover.

What is certain however, is that any cooling induced by increased cloud cover wont be large enough to overcome the warming by increased greenhouse gases. We know that because increased GHG in the earth's past have always had an overall warming and not a cooling effect.