>>5838214Just get started, by type, divide into categories as you go along.
plates
bricks
building stuff like arches, doors and windows
small stuff like 1x1 pieces
minifigs and accessories
vehicle stuff like doors and wheels
Then subdivide those piles until you've got manageable categories. Check walmarts/hardware stores/whatever for cheap storage, stuff like pic related is very useful. It's a pain in the ass but worth it, building is nice when you don't have to dig around for parts.