2001 Boxster setting for 2 years: What to do before starting?

[911monty]

Do you know why was it parked? Was there an issue with the engine?
Pull all spark plugs.
Get a scope and look inside cylinders.
Spray a fogging oil in cylinders, Marvel Mystery oil works well. This will help to address any carbon stuck rings and valves and provide cylinder lubrication.
With spark plugs out turn engine over BY HAND at least 2 revolutions checking for any resistance.
Get the old fuel out of the tank and use fresh fuel . The whole fuel system is likely polluted with gum and varnish and may need work.
Change the motor oil.
Check the air filter and change if dirty.
Top off the coolant but I wouldn't change until after the engine runs.
There will be lots of stuff to address before driving such as tires belts brakes etc. but first see if it LIVES. Good Luck