You can start anywhere Derek.
Kitchen cabinets, in and out, closets, (maybe while changingover to summer wardrobe) and storing some winter clothes. Windows, even get the furnace ready for summer A/C use. I got a new filter, and a humidifier pad for next winter. They sell out fast if I wait till next fall. I'll vacuum the filter plenum, blower wheel, and inside the back panels.
As I'm retired, I started in January. There'es plenty to do outside now.
An old buddy rarley cleaned period. He said he lived alone, and no one visits. He let it get so gross, when he finally decided to do anything, he did a total makeover. Paint, furniture, carpet, all of it.