I don\'t want to sound rude or anything kido, but I don\'t think this is the best way to make an ally. First of all, an ally means someone in who you can trust, means someone that shares the same beliefs as you, and of course, an alliance means new FRIENDS and helping each others. You just can\'t go post on ebay that you\'re looking for an ally. Try to \"evaluate the market\" first, write down some intersting guilds, make some research about their members (or at least their leaders) and then contact them.
I think this is all, the rest is up to you, Good Luck.