First and foremost, download a copy of the factory service manual. Don't even bother with Haynes or Clymer.
Things I would do if this was my bike before even attempting to start it
1. Change the oil. Note if it smells like gas while you're at it. These bikes are notoriously for having the carbs leaking into the cylinders if the petcock is left on.
2. Check cam timing, chain tensioner, check valve clearance and adjust as needed. Better follow the service manual on this carefully since it is very crucial that your cam followers (The "T" notches) be oriented away from the engine (See the FSM on page 22) or you could risk catastrophic failure/damage to the valves.
3. Open up the right crank case cover and clean out the oil pump/slinger. You'll need a special spanner wrench for this or you can make one.