Where do I enter mileage on business taxes and the cash that I paid part time employees that don't get W2

You can choose between mileage or actual expenses. In order to claim vehicle expenses and mileage, you need to add a vehicle to your business; here are the steps in TurboTax Online:

1. Navigate to Federal > Wages & Income > Self-employment income and expenses
2. Edit your business 
3. Choose add expenses for this work
4. Choose Vehicle and Continue
5. Vehicle now appears in the list of expenses, choose the pencil icon to the right of vehicle expenses
6. Answer the interview questions about the vehicle, and enter the related expenses

As far as the employees, they should have their wages reported via a W-2, unless they are independent contractors and not employees (see: Independent contractor (self-employed) or employee?). If they are independent contractors, you can issue them a 1099.  It is not allowed to pay employees and not pay the employer's share of their FICA tax. See:  IRS Publication 15 Circular E, Employer’s Tax Guide  

See: Tax Topics for Freelancers, Contractors, and Consultants