Retirement tax questions

I’m in a similar situation, and very interested in what I have to do to file 2018 and 2019. 

I did read somewhere that you could do a free file through the IRS, I assume that would be abbreviated but I’m not sure. 

Maybe doing two separate irs free files for 2018 and 2018, and just putting $0 in everything, would be enough? 

The last thing I want to do is submit something incorrectly and have the payment be delayed while I have to deal with fixing it .