For the clearcoat,Clear coat, will you be airbrushing or using a spray can,for airbrush,you can use Testors,Alclad,Vallejo,there are many.If you go with a can,I believe Testors has Spray cans too.
True the carrier will have a matte finish,but if you are using decals,then they need to be applied to a gloss surface for better adhesion.
Not sure about that airbrush,Google Don Wheelers airbrush site,lots of reviews and great info.
You probably need to go lower with the psi on the regulator,10 psi sometimes lower depending on what your painting.
No problem with the placement of your questions,but you should check out the different sections and try to get them in the closest match,you get more specialized answers.
Hey ,I did that kit in the 80's when it first came out,paid about $100 for it,thought that was a lot then.So post some pics in the Ship section.