Better to file separately or jointly? I own a single member LLC and my spouse has a FT job w/higher income (for now)

I own a single-member LLC mobile food stand and my husband, who volunteers to assist with certain non-administrative aspects of my business, currently makes low six figures at his own FT job (a lot more than I do as I just started this business in 2023). To be clear: my husband is not a registered member of my business; he is just helping me get it off the ground. No shared assets (other than a car) and no kids yet. He pays rent/utilities and we both get medical through his paycheck. My questions as a first-time Schedule C filer:

 

1) For the most tax savings, should we file separately or jointly? (see other related questions below)

 

2) Can I deduct my home office if I'm not the person of record paying the rent?

 

3) Can I deduct business use of my family cell phone plan for both my husband and I even though he is not a registered member of the business? (I pay the cell phone bill)

 

4) I heard that you can deduct your health insurance premiums regardless of who pays it (as long as you're on the plan). Is this true? If so, where would I make this deduction?

 

5) Anything big I should know right now as a first-time Schedule C filer?

 

THANK YOU!