Yeah, need to start smaller first...3v3 ladder
8v8 ladder would be almost impossible IMO. First, vacations boot you from the ladder, so if any of the 8 people on your team go on vacation, that team won't be on the ladder until they get back. How many 8v8 teams could you even have? There are like 150 clans, but I bet a good chunk of those don't even have 8 people active.
What template do you use for 8v8 anyway? Here is a 7v7 game I made: https://www.warlight.net/MultiPlayer?GameID=8141088