New to it, 95 cutlass sitting for 20 years

[skifrog]

HI

hope I am in the right place.  I am trying to help my sister get her 95 cutlass convertible up and running. It has sat in a garage in Palm Springs for about 20 years and I am looking for info on steps to take before trying to start it.  I assume it turns over, but have not looked to see how I would check that. Been thinking to put some WD or Mike Marvel oil in the cylinders to soak a bit, but the rear plugs look intimidating.  Any info & suggestions appreciated. I wrenched a few old SBC & 60/70 Buick V6 in jeeps, nothing as modern as this.

thanks