You can order an official owner's manual from the Big Green K, it'll be standard OEM pricing though, $27,000.00. Alternately, you can look at a Clymer's manual or the shop manual itself. You can also search this forum and ask the guys here specific questions, you'll probably learn more from that than from the manual anyway. You can join COG and get access to all kinds of goodies, assuming you haven't already joined. (It's hard to tell on the forums) The Best of Chalkdust is probably the highest prize, which gives all manner of fantastic maintenance info on the bike. There's precious little that a competent and patient person can't do on this bike, which leaves me out but probably covers you.

Kawasaki has schematics available from their website and they also have a handy spec sheet, both of which can be gotten from the Owner Info link. The rear shock is an air shock, it can be accessed by removing the right side cover. It has a push rod that manages preload in four settings plus an air valve. DO NOT use compressed air on it, hand pump only. You definitely want to check out Murph's.
http://www.murpskits.com (not misspelled) His side cover knobs are a must have in my opinion, they convert the screws holding the side covers into knobs. The front suspension preload can be adjusted with two bolts under the caps at the top of the forks (if you still have standard springs on the bike, could've been upgraded by PO). The clear window is a 'card holder' or some such nonsense. It's a pointless doodad or boondoggle in other words. The boys here like 'farkling' which is the art of purchasing or manufacturing accessories of spurious necessity for their Connies in lieu of providing themselves with food and shelter.

(Yes, yours truly is as guilty as the rest) She is top heavy to be sure, especially with that enormous gas tank, but she's not unmanageable at all once you get used to her. Depending on tires and suspension settings she can be a long distance comfort slab rider or a lithe canyon carver. What she becomes has more to do with what you like than anything else. Far more experienced and wizened fellows than myself will soon chime in, but the bike you've just added to your stable is universally recognized as the best bang for the buck in sport-touring. You probably didn't even know how shrewd and discerning you were.