There are hundreds of literary agencies. And thousands of literary agents. One of them can be the champion of your work. They will secure the best deals for you, guide you through the marketing process, and support you and your work until your book finds a solid place on as many bookshelves as possible. But the majority of the agents are not the right ones for you. Not because you were a bad writer. But the agents specify a lot and the literature world is very rich. You need to send your queries to people who actually work with books similar to yours. Especially if you write in a marginal genre. How do you choose whom to approach in the first place?