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.

Thanks