Here are a few sites to help you with donations. From donation-pickup, moving services, and free shipping labels. These sites make donating simple to do.
ex:
Salvation Army offers free pickup service and accepts clothes, household items, book furniture, and cars.
Restores offers to remove furniture as well as building materials such as lumber and bricks.
Give Back Box offers you to place your items in any shippable box and send it via UPS or Postal.
Salvation Army
Restores
Give Back Box