Thanks for all the great advice. I certainly will do a check on all the fluids. The PO was a very meticulous guy, I could tell by how organized his garage was, (That and the gorgeous 1969 Ford Bronco he had in there) so I'm not too worried about them. However, it'll give me a chance to familiarize myself with the bike.
As for battery tenders, it depends on what you buy. If you get a "smart" one that has a microprocessor and monitors the health of the battery, those can be worth it. However, cheap ones like trickle chargers that simply supply a constant, albeit small, current to the battery will actually shorten the life of the battery and likely fry it. At the end of the day, it's not really the best thing for a battery to always be topped off. They need to cycle a bit (80%-100% is good) to remain functional throughout their intended charge range. The best way to check the battery is to measure the voltage level relative to the manufacturer's specs, so check it every once in a while, but you don't need to throw the tender on it every time you turn it off. It's gonna go up and down but that's ok.
The best thing for battery storage is to take it out, charge it, store it someplace warm (ie inside) and top it off once every month or so. Small batteries like these aren't meant to last forever, so just make peace with the fact that every few years, you're going to need to buy a new one. And always charge on the lowest amp setting, normally 1.5 to 2 A. Not just soapboxing here. I'm a patent attorney with an electrical engineering degree and I've done a lot of work on batteries.