Retirement tax questions

Thank you macuser_22! So, does this seem right? Example might help:

 

1) July 2019: roll over ALL traditional IRA funds (100% pre-tax) into 401k plan (this is permissible for me and now complete). Traditional IRA balance now = $0.

 

2) August 2019: make $6k non-deductible IRA contribution from after-tax cash. Leave contribution in cash so as to avoid investment losses and thus ensure that the full $6k value of the contribution can later be converted to Roth.

 

3) December 2019: Convert $6k in traditional IRA (non-deductible) cash to Roth IRA, then invest.

 

Does that sound like the right process? MUCH appreciated.