For your first question, you would enter the value of all of your traditional IRA's at end of year, which would include non-deductible contributions.
For the $500 non-deductible IRA contribution, when you add your IRA contribution in TurboTax, you should come to a screen that says Choose Not to Deduct IRA Contributions where there will be an option to make part of your contribution nondeductible. You should enter the full amount of your non-deductible contributions for 2020 there.
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