How do I know what features to pick for an MMM

I’m wondering how I know what features to pick for an MMM

The features I have are

“Total Sales” (Organic + Third Party)
"Organic Sales",
"Third Party Sales",

"TV Budget",
"Radio Budget",
"TV GRP",
"Radio TARP",

"Paid Google Impressions", ("Paid Brand Google Impressions" + "Paid Generic Google Impressions",)
"Paid Brand Google Impressions",
"Paid Generic Google Impressions",

"Rainfall (mm)",
"Temperature (F)",

"Paid Google Clicks",

"Google Search Ranking",
"Competitor Google Search Ranking",

"Twitter Followers",
"Twitter Likes",
"Twitter Comments"

This is the heat …

brand budget datascience features google impressions radio sales