Congrats on selecting a GREAT bike!
+1 for the OWNER'S manual on the Kawi site. Do not confuse this with the SERVICE manual - for which you can find links for out there for pirate-ware copies - if that's how you roll. Personally I think it's best to BUY a paper copy of the SERVICE manual. I did this for my other bike (HD) and it was THE BEST 40 bucks I spent on that bike.
I'd change the oil now and then every 3K -or every season if you don't ride much, check other fluids and lube the shock pivot as well. If you're anal about maintenance - you'll want to flush the brake fluid every season or two (my V-Rod uses DOT4, and it's DIRTY after a season of use - haven't messed with the Vulcan yet) and maybe the coolant after a couple of years - but it's a Kawasaki. You're just not going to have to mess with it much if you keep the oil changed, the belt and tires checked, and the other fluids monitored - until you get to 15K for the valve check/adjustment.
If you have a dealer maintain the bike - double check their work.
If you do your own oil changes - use the oil/filter combo you like. If you change them every season/3K - then it's really hard to do that "wrong". U-tube has a good "how-to" for oil changes for the Vulcan.
The oil filter is probably going to be really REALLY tight. I lucked out. My Exmark uses a similar filter and I had a cap for it - but you might need a strap wrench - or an old leather belt.
Use 87 (Regular Unleaded) gas.
Ride the bike.
MOST IMPORTANTLY of all... Take the MSF course if you haven't already done so.
If you're in the military - they make you take it AGAIN if it's been over three years...
EDIT - oh...you have three other bikes. You prol'y already knew all the above. Good LUCK with the bike!