Hello, welcome to the forum!
Your guinea pig is really handsome! I'm not sure what breed he is - sorry!
A baby male is a good choice for a friend, as the baby is usually submissive to the adult. You may find as the baby begins to grow up (around 5 months) he will try to become dominant, so a bit of arguing is to be expected.
You could also get Indiana nuetered so he could live with the female. Make sure your vet is experienced, so that he is in good hands. A male/female pair are very unlikely to not get along in the future.
This is a good page all about Guinea Pig's Social Life
http://www.cavyspirit.com/sociallife.htm
Good luck
