What you describe is not a backdoor Roth IRA conversion. It is just a normal Roth IRA conversion. For a backdoor conversion, you would make non-deducible contributions to a traditional IRA, then roll that over into a Roth IRA. Consequently, there would be no tax on the funds rolled over.
In your case, to roll a traditional IRA balance over to a Roth IRA, the amount rolled over will be taxable. You just need to report the Form 1099-R in TurboTax and answer the questions in the program.
The contributions to your employer pension plan would not be considered a contribution to an IRA. It is true that you likely will not need your Roth IRA basis going forward, since all of your distributions going forward will be tax-free, but you do need to report your contributions in TurboTax to make sure they are allowable each year, as there are limitation on that based on your total and earned income.
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