69 GTS restoration tips advice needed

my boss asked me to take over the restoration of the 69 Dart GTS. it is already painted and the glass is already in it, but the interior still needs to be restored. as well as most everything else. I have never done a restoration before so I am not sure what to do to the plastic interior stuff?
What have you guys done to restore the dash pieces and center console stuff? I already did the steering column. and just watched a video on doing the steering wheel, so I am going to start prepping it tomorrow.
here are a couple of pics of the car as it sits now. it is a #'s 340 4speed car, for the most part being restored with updated suspension and brakes. no 4 link and coil over bs just big torsion bars and modern leafs with good shocks. and 4 wheel disks.

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