Alright. Yours is basically the same engine as my CForce 800 xc ATV.
Yes, the Transmission oil is separate from the engine oil.
You also have two diffs and some other things to check as well.
Mine came factory with maxima 10w40 mineral based oil and 75w90 Synthetic Gear oil in both diffs and the transmission.
The owners manual has the basic rundown on the maintenance and break in routine.
Call the shop you bought it from and find out WHAT oils they used as they might have used different grades.
Also, GET THE SERIVCE MANUAL, it is much clearer on certain aspects of the task and gives you a good breakdown on "how to get to your engine".
The Valve adjustment was very straight forward and easy. Just take your time and be patient.
Ive done a lot of mech work before but, really even in the ATV frame it was a pretty easy task, like a TWO on a one to ten scale.
You need a trim puller set to pop the plastic push pins. the narrow forked one works great.
A good set of feeler gauges a good Flat blade screwdriver an an 8 or 10 mm wrench for the actual valves.
I ended up using a mirror for my front exhaust so I could see my gauge, but that might not apply on your chassis.
heres a link to a list of vids on the subject, too.