My car sat for 6 years without being started up. Unless you can get your engine's oil fully up to temperature by driving it around for extended periods, you should just let the car sit as infrequent starting can be more harmful than just letting the car sit.
I drained ALL the fluids...engine, trans and rear axle and replaced them with new fluids. New oil filter too. I siphoned out as much old gas as i could and put fresh new 93 octane gas in it. I did new spark plugs, but that was just because...not really reqired. What i did do was put some Marvel Mystery oil in each spark plug hole with a syringe and then turned the engine over a few times by hand. Then i put the plugs back in, disconnected the coil wire and cranked the engine over a few times with the starter.
Finally i hooked the coil wire up and fired the car up. Took a few cranks, but it started and idled fine except for a sticking lifter. Some running time freed the lifter up and it ran fine after that.
As for other maintainence...well just inspect everything. I rebuilt the suspension and brakes so that was all brand. Tires usually have a 6-year service life as oxygen can begin to deteriorate the rubber. So keep that in mind when deciding if you should replace your tires.