form N-400 Questions

[Shimura 0]

Dear all, i am about to file the citizenship form but i have few questions about it :

Part 2 >> #6 USCIS Online account number >> What is this?

Part 10 >> #8 about how many times has my spouse been married >> is this including with our marriage or just the previous ones?

Part 10 >> #8 C >> about prior spouse date of birth >> how if he doesn't remember ?

 

Part 12 >> #7A >> The answer is No

7B If you answered "YES", did you consider yourself to be a "non U.S. Resident? >>> Should i mark "No" or just leave it blank?

 

Is there any example letter of explanation to describe about my spouse's prior marriage?

 

Should i sending them some of utility bills, Insurances etc ? or just sending them what is in already on the list ( Form M-477 )?

 

I think that's all that i can think of for right now, thanks in advance for your help.