Do not re-enter until the fire department says the structure is safe. Then contact your insurance company to open a claim and arrange temporary lodging, secure the property with board-up and tarping, retrieve essential documents and medications if permitted, photograph everything, and arrange emergency mitigation for the water used to fight the fire.
Hard non-porous items, metal, glass, ceramics, many electronics, jewelry, most solid furniture, and a surprising amount of clothing and textiles can be restored through specialty cleaning. Items directly burned, melted, or charred are losses. Porous items heavily saturated with smoke residue, including mattresses, upholstered furniture with penetrated foam, and food, are usually discarded.
Fire damage restoration runs in a fixed order: secure the structure with board-up and tarping, extract suppression water and dry the building, remove burned and unsalvageable material, clean soot and smoke residue from surfaces and contents, treat odor at the material level, then rebuild. Skipping or reordering steps, particularly cleaning before drying, produces poor results.