home office expenses

I'm trying to figure out what I should claim as part of my home office expenses.  My company closed the campus and told us to work from home on March 11 of 2020.   I own my home with my spouse and don't rent it out.  I have put in the sq footage of both my office and whole home. Here are my questions:  Thanks in advance. 

 

1. Should I claim that 83% of my total income was earned from my home office (10 mos)

2. Should I enter my mortgage interest for the whole home?

3. If I enter my property taxes in this home office expense section, do I need to adjust them in a different section?  I had entered them previously under prop taxes.

4. Can I claim my whole cell phone bill?  This is the only phone I have available for work (and I use it daily for work), but I also use it for personal use.

5. Should I enter my electric bill and water bill for the whole home?

 

Thanks again.