my 0.02-
Don't change things for the sake of changing things. Do you know for sure it needs a new battery ? The battery might take a charge and be just fine. If the fuel tank was properly capped, and hopefully more full than empty, good chance that is just fine too. I agree with changing the oil. Run it, see how it goes. One concern that comes to mind is the bearings on the idler and tensioner pulleys (both accessory and timing belts...) that could have developed rust from sitting for extended period without running... potentially leading to short term failures. Once it is running, watch the belts and oil and coolant levels like a hawk for at least the first couple months.
Congrats on your acquisition!