Vehicle issues and incorporation date with Change Single Member LLC taxed as sole proprietorship to taxed as S corp

I have a single member LLC taxed as sole proprietorship for  more than10 years and I elected to be taxed as S corp starting Jan 1, 2023. Nothing else changed with the company (name,  EIN since I have payroll and employees).  

 

When I file Turbotax Business return for 2023  1120-S , I have several questions --

1) incorporation date -- should I say Jan 1, 2023 (the day S-corp election become effective) or the date on article of incorporation when I set up LLC in 2011? 

2) I used to use a vehicle about 80% for business purpose and I deduct the expense on schedule C through actual expense method. Now this car is already full depreciated,  can I use this car by standard milage method with S corp? I understand this has to go through accountable plan for reimbursement. But I am just wondering if I can change the method for deduction. 

3) For all old assets on my LLC (like office furniture and equipment) , they have been fully deducted or depreciated already.  Do I still need to add them on my asset sheets for S-corp?  If I do need to add them, how do I add the value etc 

 

Your help is greatly appreciated.