Apply primer to any newly repaired and cleaned areas before applying the topcoat. A primer may not always be necessary on all surfaces, but it aids in good topcoat adhesion and a smooth surface. Be prepared to ventilate the room while painting and for the time afterward that is specified on your paint can. Protect all the surfaces you do not want painted. Remove as much furniture as possible and cover the remaining pieces and the floor.
Paint tends to stray to the oddest places.
Be sure to loosen lighting fixtures and remove cover plates as well. Recommendations on this web site do not endorse any commercial products or trade names.