1. I was a single applicant, hence had no dependants. but i guess if the form asks for the same you should. I included my mom as a non dependent relative whos not accompaning me. didnt have to submit any details other than her passport details.
2. I was not allocated a CO so didnt submit form 80 and 1221
3.I was the only applicant on both 475 and 887. I know a person who was the same as you and she still managed to get 887
4. i did not submit a resume.
Hope this helps :)