Excellentr advice thus far.
Cats are territorial by nature, and they give interlopers short shrift at first.
Your kitten will learn your queen's moods, when to play, and when to avoid her.
Similarly, she will grow to tolerate, and then accept him - this is normal cat hierarchy in place. When your ikiten grows, he will learn to assert himself, but in the mean time, it is as well to feed him separately, and as advised, fuss your queen to make sure she knows she is still top cat.