I want to copyright a video game I'm making but I want it to be part of a series where each title of the game will begin with the same prefix and end with a unique suffix for the game. I want to have ownership of the prefix so others cannot make any other games with it. For example, EA owns the Battlefield series and no one else can make games related to that. I think I'm probably thinking of more of a trademark and not a copyright but I'm not sure. How can I copyright/trademark and protect the prefix of my game for when I want to make another game related to the first?
For a different game I'm working on I want to include music made by composers who have their music protected under the CC 3.0 license and I have permission to use their works in a commercialised product as long as I'm not just reselling their music as is and without any form of modification. Obviously, since it's a game with graphics and other music that will be made by my team I will want to protect those assets and the game under a copyright, but if I copyright my project with music protected with a CC 3.0 license, would that cause problems with the copyright preventing me from protecting my stuff?