You cannot upload a map directly to warmerise from any other app. You first have to import the map in Unity 3d, download the warmerise setup package, import that into your map, and then export the map. You can then upload that exported file into warmeirse and wait for ratings to approve your map.
Read this: https://warmerise.com/forums/topic/432/custom-map-tutorial
And if you want a map for clan wars, any map would work for that.