I bought car in 2019, how do i find the information i need to enter it into my taxes for a deduction?

What is the care being used for?  Business because you are self-employed?  Or is this your personal vehicle?

Or are you talking about the sales tax deduction?

SALES TAX

You can enter the sales tax you paid for the car you purchased in 2019 by going to Federal>Deductions and Credits>Estimates and Other Taxes Paid> Sales Tax.  You will be asked if you paid sales tax on a major purchase, and you will be able to enter the sales tax you paid for your new vehicle.

Sales tax is an itemized deduction.  If your state has a state income tax, you have to choose between using the deduction for your state tax paid OR the sales tax deduction, whichever is higher.  The TT process will suggest one or the other as you prepare your return.

“Major purchases” that you can enter for the sales tax deduction include:

Motor Vehicles (cars, trucks, motor homes, RV’s, sport utility vehicles and off-road vehicles

Aircraft or boats

Mobile homes

Manufactured housing

Building materials for major home improvements

You cannot deduct: furniture, jewelry, home electronics such as TV’s or computers

https://ttlc.intuit.com/questions/1901222-which-deduction-should-i-choose-sales-tax-or-income-tax

https://ttlc.intuit.com/questions/2566624-how-much-sales-tax-did-i-pay-last-year

https://ttlc.intuit.com/questions/3148443-how-do-you-define-major-purchase-or-major-item-for-the-sales-tax-deduction

https://ttlc.intuit.com/questions/1900791-how-do-i-find-my-local-sales-tax

https://ttlc.intuit.com/questions/2566624-how-much-sales-tax-did-i-pay-last-year

Itemized  deductions have no effect unless you have enough to exceed your standard deduction.

If you bought an electric car or a hybrid, you are looking for the vehicle credit. If you bought a regular car, the sales tax could go on your itemized deductions with your general tax. Since only about 5% of people itemize, that may not be for you. If you are using the car in a business, you will enter it in your business auto information.

Electric car link

Department of Energy- complete list of possibilities

The post by @xmasbaby0 has great links for sales tax as an itemized deduction.

Please respond with further clarification if this is not sufficient to answer your question.