Way, your new kitty is adorable!
As for acclimating the cats to each other, I'd just take my cues from them. I've read lots of stuff about how, when you bring a new kitten into the home, you should put it in a separate room and let the older cats have the run of the house. I think it's not only to protect the kitten, but to make the older animals not feel like their home is being taken over.
I got that advice when I brought home my Suki. Jasper had been an only cat for 6 years and I wondered how he'd react to an "interloper." Well, he hissed and growled (mostly at me!) for about a day and then he was fine. Suki is so gregarious and sweet that she sort of won him over by force! I never had to put her in a separate room or do anything to smooth the transition. They just kind of worked it out themselves. I think it's a lot easier when you're bringing in a kitten rather than another adult cat. At least your big guy has a size advantage! Most cats have a mothering instinct, regardless of gender, and they want to take care of a baby. Jasper used to clean Suki to within an inch of her life. Maybe he was just trying to put his scent on her, but it helped them bond.
Let us know when you've come up with a name for your little cutie!