Reporting Business Income & Expenses

I started an single-member LLC (disregarded entity) this year.  LLC income and tax liabilities should ultimately flow to my personal return:

1. Does QuickBooks data link/flow to TurboTax?

2. QuickBooks tracks my personal car business mileage, but it does not create an expense line item on the QB profit and loss statement. Does mileage get claimed as an expense in TurboTax based on mileage tracking within QB?

3. Does TurboTax determine FICA payment liabilities at the time of completing the income tax return(s).  Note this year the LLC will not have enough profit to proactively withhold/pay quarterly taxes 

4. How does my LLC business return link to my personal return? Do I need to do this manually when entering data for my personal return?