You have some reading to do. Everything you need to know is right here, but you need to put some effort in. Take some time to read some of the material already here, and you'll have an "aha! I get it!" moment.

Guides

Software tools forum

Forum search facility

Better, but off-site search facility

Wiki

Video - how to set up your first group

When you've done that, come back with a specific question and we'll try to help.

Hint: try running both WoWs in Windowed mode, and if you don't know how to do that then Google is your friend.

With the above links, don't you dare come back and ask how to get keys sent to both WoWs at the same time....