*Please forgive my lack of Stata/Statistics knowledge or basic questions, I'm fairly new to Stata and statistics in general. I've tried other avenues of learning and understanding it but it's all been a bit overwhelming thus far so I'm hoping someone can point me in the right direction*

To give a brief background, for my research I am assessing whether the presence of a Chief Sustainability Officer (CSO) will affect the Sustainability Performance of a firm. Also, I would like to test whether Degree of Firm Multinationality has a Moderator effect on this.

Data
32 Firms
(DV) Sustainability Performance: Measured as a score between 0 and 100. There are two measurements one in 2012 and 2017.
(IV) CSO Presence: Measured as a Yes/No in 2012 and 2017. Currently, all firms have a 'Yes' for both 2012 and 2017.
(Moderator IV) Degree of Firm Multinationality: Measured between 0 and 1 using the firm's (Foreign Tax/Total Tax) for 2012 and 2017.

Control Variables: Firm Size, Firm Age

I used a youtube tutorial to set up my data, import it to Stata and run a panel regression for the effect of CSOpresence on Sustainability Performance. But CSOpresence was omitted due to collinearity. Is there something I can do to solve this? Are there any other tips on how I can setup my data etc that will help me run this panel regression? Are there some other things I should do? I'm also unsure if a fixed effect or random effect regression is suited for this.

Literally any and all advice would be much appreciated!

Also, if there is a problem regarding the data, my research is flexible so I am able to change things such as years of measurements etc (as long as it isn't the variables themselves).

Sorry for the long post and quite basic questions, but I hope someone can help me out. Thanks in advance!