I'm posting this in three parts. Here's the first part:

1. Please describe the physical appearance of a house elf.

House elves are between two to three feet tall, with spindly arms and legs and over-sized heads and eyes. They have pointed, bat-like ears and high, squeaky voices. Rather than conventional clothing, house-elves wear discarded items like pillowcases and tea-towels.

2. Kreacher is the house elf of which wizarding family?

House of Black

3. What is Hermione Granger making for the house elves?

hats and socks

4. How do you free a house elf?

If their owner gives them an article of clothing, it breaks the "enslavement" and the house-elf is free.

5. What does S.P.E.W. stand for?

Society for the Promotion of Elfish Welfare