Answer:
1: Lady Macbeth is powerful, ambitious, and two faced. She will do whatever she can for power, and is heavily devoted to her husband.
2: She almost gaslights Macbeth into feeling as if he should commit the murder. Bringing up her own devotion to him, and filling his head with the greatness they could obtain by killing Duncan.
I can't really answer 3 and 4, but I wish you luck :)
Hope this helps :D