Congrats on your new addition!!! Linus aka Mr. Wiggles is gorgeous and it sounds like he has a great personality too. I've always wanted a flamepoint and may adopt one some day.

The key to introducing two cats is to take it very slowly. You can rub both cats with a towel so that they can get used to each others scents. You can also let them sniff each other through a closed door and see how they react. Hissing and growling is normal. I don't know how large your place is but if you can give Linus his own room or space for about 1-2 weeks this would be ideal. When they are out together, you should supervise them until you're confident that they're okay to be alone together. You should also let them work things out unless there is bloodshed. Good luck and please keep us updated.