Provided you intend this for your clan rather than public all you need to do is take an old map copy it, rename it, give it a new loadout, and distribute the new map to your players. Once everyone has the new map it is very simple to change the loadout. All you require is a new Server.zip which is less than a megabyte.
If you want I'll make you a map. Just send me a pm listing the map and tanks you want. Include respawn times and infantry kits if you want them. If you want to learn to do it yourself I can talk you through it.