There's a C Force section on the board that covers the 800, and I saw that somebody posted a .pdf of the manual on there, but you'll have to be logged in to download it.
I don't know about taking off the seat, I've got a side by side, so it's a bit different. I'm not sure where they put the dipstick at either, but that'll be in the manual.
Initial service also includes greasing it up, and checking to make sure your filters are still in place, and not clogged with dust. The grease might be part of the squeaking you're hearing, it's not unheard of for a dealer to miss a grease nipple on final assembly when they get it out of the crate. I use TRC Crown & Chassis grease, it sticks to the parts, and doesn't get chased out by water.
Also, welcome aboard!