I chose this image because this post is really about what comes BEFORE a steamy cup o' coffee. This curated content is related to the work we need to accomplish BEFORE submitting to agents.
Start with this fresh post Do I Need an Agent...by Giuseppe Castellano [from his website: Giuseppe Castellano is an award-winning Designer, Illustrator, and Executive Art Director at Penguin Random House; with over seventeen years of book publishing experience]. Even though the post leans slightly toward illustrators, it is a very thorough look at the agent search experience.
Then, investigate In The Inbox which offers online query advice from a smart literary intern. Although she hasn't posted since August (presumably because she is overwhelmed with queries!), there is a wealth of information here including a chart to ensure a query is ready to be sent: https://intheinbox.wordpress.com/
Another valuable resource is Literary Rambles that provides interviews and information on many children's literature agents.
Hope you find these beans helpful!
This blog shares insights on the craft of writing children's books and the publishing industry, and supports creators on their journey.