You won't have a basis in the traditional IRA because you rolled over pre-tax funds. Distributions from the traditional IRA will be fully taxable unless you made nondeductible contributions in the past. If you did you then you should have Form 8606 when you made these nondeductible contributions.
If your conversion basis didn't carry over then you can enter them after you entered all Form 1099-Rs in the follow-up questions. You also can enter the net contributions prior to 2024. If you do not know them you will have to check your past records to see if you can find the contributions for each year.
To clarify, are you over 59 1/2? Did you have the Roth IRA for 5 years? If yes, then you have a Qualified Distribution which isn't taxable and you do not have to worry about entering your net contributions prior to 2024 and conversions prior to 2024.
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