Hi, Shirley,
One of the most believable and therefore persuasive books I’ve ever read was Messages of Hope, by Suzanne Giesemann. She’s a medium, much to her surprise. I’ve also taken her online course on mediumship, which really lead to some breakthroughs. If you’re more interested in channeling, I recommend the book, Opening to Channel, by Sanaya Roman and Duane Packer and their Guides.
Hope those get you started! Thanks for the read and the question!
Blessings, Jodie