External tech support-what login info to give

I need to hire someone to look over my Cloudflare settings, especially relating to my email settings. I want to make sure I know what info to provide this person and what to change, if anything, after they’ve completed the task.

According to InMotion Hosting I do not have the correct DKIM, SPF, and PTR information set on Cloudflare? Something like that.

Too many of my emails being sent using Thunderbird are ending up in spam folders.