Make your inventory as complete and detailed as possible, and remember to update it as you purchase new items. Take pictures or a video of each room, including closets, storage, the attic, inside each drawer, etc. Date stamp each photo and video with the date they were taken.
If available, take pictures of receipts, brand names, and serial numbers of each item, especially for costly items. Review your policy's personal property coverage limit annually and ensure they are high enough to cover the items on your inventory.