With respect to the At-Risk loss carryover, you would enter those figures in the Business Income and Expenses section under Special Situations (as you mentioned).
Hopefully, you are aware that TurboTax does not support the calculation of an NOL (a negative AGI does not necessarily mean you have an NOL). The NOL Worksheet is available at the link below.
https://www.irs.gov/publications/p536#en_US_2019_publink1000177330
Frankly, with the issues you raised, you might want to seek guidance from a tax professional.
