Start at the top of a room and work down. ie dust the lights, the tops of bookcases, top of the door, then pictures/mirrors, then surfaces, then skirting boards, then hoover last.
If the dust is thick, use a damp cloth and rinse it often
Don't worry about a million different cleaning products. Washing up liquid is safe to use everywhere and good at cleaning things. Window spray on a microfiber cloth for windows, mirrors, glass
Wipe down things you touch often, cupboard doors in the kitchen, door handles, lightswitches, plugs, doors.
Wash blankets, cushion covers, removable sofa covers, curtains
Clean marks of painted walls and woodwork with a magic sponge. Touch up paint as needed
Treat any mould and repaint if needed. HG mould remover spray is excellent for walls. Mould magic gel is excellent for grout, silicone sealant in the bathroom and around window frames.