I read a A Starseed Guide Andromeda, Pleiades, and Sirius by Eva Marquez recently and found the information surprisingly resonant. I say surprisingly because inexpensive (actually free if you have amazon unlimited) ebooks do not always live up to their hype.
In this instance however, I was very pleased. I found the overview the author provided on the various types of Starseeds informative and well structured - as well as quite closely aligned with my own belief system (something that doesn't always happen for me with channeled works!).
I also absolutely loved that Marquez shared her own extra-dimensional journeys in the text and really enjoyed reading about her adventures.
When I was done with A Starseed Guide I checked out the author's youtube channel. Her meditations are lovely and she has a gentle soulful energy that is very appealing. You can listen to her Mt. Carmel Energy Meditation below and find many more on her channel.
In summary, there are a lot of books out there on Starseeds but I feel that Eva Marquez's book is particularly sound and a very good place for the Starseed curious to start!