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Unless color is dark, such as black or dark blue, plastic is somewhat translucent, and primer is recommended to block the light from passing through.
A body, prepared with primer have a solid feeling, eliminating cheap toy-like look, when compared to unprimed body.
Also, primer helps you find scratches and manufacturing imperfections such as sink marks or deformation due to heat. Plus, primer will help paint grab the surface.
Clear coat is optional, if the body color is solid, but it's highly recommended on metallic. Clear coat will create rich and deep wet look, just like a real car. (Real car is clear coated, of course.)
Lacquer is a type of a solvent, and the term is often used to categorize the type of paint.
Lacquer base acrylics, water base acrylics and enamel are common for hobby use, and each has pros and cons.
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