1. Yes you are the primary sponsor because you are your husband's petitioner.
2. Your friend is a joint sponsor.
3. 4, which means her household of 3 plus your husband.
I agree with Mr. Iziokhai. Your friend will count her 3-member family plus your husband.
All the best!
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I agree with my colleagues. You are the primary sponsor and your friend is the co-sponsor. She will count the members of her household plus your husband. which means that you must complete and I-864 even if you are not employed and do not have any income. Your friend will complete a separate I-864 and provide all required supporting documents. It may be adviseable to get the assistance on an experienced immigration attorney to ensure that your case is properly documented. Best wishes.