I went on MN tax yesterday after my session with you and paid the$350. that is owing. Do I have to do anything else to get you to file my returns?

Go to Review in the left hand margin.  If it clears Review, you will proceed to the File process.  There you will need to provide proof of identity and have the AGI from your 2019 tax return.  When asked how you want to pay for your Minnesota tax due, indicate you will mail the payment in.  That should take you to the filing process where you can print your returns then file.

...really though...you should never pay the taxes due until AFTER you have e-filed, and had the  filing accepted already.

Why?  What if your e-file is rejected, and your correction to get it to go thru results in either a lower tax...or more taxes owed.