Query Letter Critique
If you're looking to be traditionally published, you will need a query letter. A query letter has 3 parts: the hook, the pitch (takes from your book description), and your bio. I also think it's important to say why you want to work with the agent/why they would be a good fit for you (like a cover letter). And because you want to make a good impression, you will need a second pair of eyes on it before you ever hit send.