Prep for Painting New Wooden Interior Door
Simple masonite doors can be painted in place. You only have to seal tops/bottoms of solid wood doors, to prevent moisture from warping them.

The primer is laughable, but functionable. Plan on two coats of your topcoat paint. Personally, I'll paint them with a coat of flat, then a coat of semigloss, to prevent that built-up look, bit that's personal preference, not the law.

As far as rolling, go right ahead. Not my preference, but I'll do it in a rental without blinking an eye. Not as nice a finish, but again, that's an opinion. I have lots of opinions. If you do roll, do yourself a favor and use a small whiz-roller- the kind that has a fuzzy outside edge, so you can get some paint into the panel profiles. Keep a brush by your side to brush it out when you're done.

All paints will work. If you go satin or semigloss, it won't stain as much from dirty paws.