I am not sure it this is the right place for this topic, but...
My Firebird has been in 2 accidents in the past 2 weeks, (neither my fault). I have decided to park it, and start working on fixing the body damage, and all the body mods I want to do to it. It may be parked for a year or two before I get it finished.

Is there any recommended things I should do before putting it in storage? Fuel additives? change oil? etc.

if its stored indoors, the only thing you need to do is fill up with 87 fuel, add stabil fuel stabilizer and make sure all your fluids are topped off (brake, oil, coolant etc.). when you are ready to start it again, change the oil, make sure your fluids are topped off.