First of all, you need to find someone to play with...usually, we do this via MSN Messenger.
Anyways, I'm gonna assume you are hosting. In AoE/RoR, go
Multiplayer -> TCP/IP -> CreateNow, go to http://www.whatsmyip.org/where it will tell you your IP address. Give this to your friend. They should now goMultiplayer -> TCP/IP -> Join Existing Game and insert your IP address (usually via Copy Paste).Does that answer your question?