Glueing and Priming

You need to plan ahead and think it out.You have to build and paint in assemblies.There are diffrent approaches of course,I would spray my deck,hand paint the small fittings that are molded to the deck.Assemble the various superstructures and paint them,then carefully glue them to the deck

What you should do is examine the build log posts in this ship forum and see how the builders approach diffrent ships.Each has its own nuances and each builder pursues a different plan.

I pretty much do it the same way.  I finish all hull painting before adding deck, paint the deck seperately, paint superstructure seperately.  I also paint any PE before installing it.