I would change the oil & filter, and unplug something like the coil packs or even the ECU and wind the engine over on the key until the engine gets oil pressure and the oil light goes out - then re-connect what you unplugged and start it up. It may blow a bit of smoke for the first few mins too while it clears all the crap from sitting out from the cylinders. With the DOHC engines it may take a while when turning over on the key for all the hydraulic lifters to pump up correctly and close the valves - have seen a few when sitting for a while will keep the valves open ever so slightly and sounds like there's no compression, but shouldn't take too long for them to start functioning properly.