Well there really isn't much of a difference as far as the mission setup goes - most milsim communities will also use the War Room features as it adds persistence and AAR capabilities. Everything you need to know is here:

http://alivemod.com/wiki/index.php/ALiVE_Data

You will need to have a dedicated server and a static IP address (or at least be willing to update the IP on the War Room page if it changes).

As far as mission making with ALiVE there are some great missions out there already. Start here:

http://alivemod.com/forum/conversations/mission-templates

Also google for "AUTigerGrad alive" and you'll get a bunch of his missions which are good to learn from.