Pitching books to booksellers

I really need to start the process of reaching out to independent booksellers, especially conservative Christian or homeschool-oriented channels like graceandtruthbooks.com, to see if they’d be interested in carrying my books. I have been dragging my heels on this because it’s uncharted territory for me, and I only get one shot with each business.

Does anyone have tips on how to effectively pitch your books to this type of sales channel? Any tips on what to say or what not to say? Any insight (or just a friendly nudge to get over myself and just do it) would be greatly appreciated.

Edited to add: These are online booksellers or small independent retailers located in other states, so contact will be via phone or email rather than in person.