Hunting for an agent isn't like trophy hunting where you want the buck with the biggest rack. Hmm, I see where that could be taken wrong. Moving along. You want, no, you need to find the agent that is right for you. Not just any agent will do. Trust me, I'm speaking with the voice of experience on this one. Connecting with the right agent starts in the querying process.
Do NOT blanket query. What that means is sending out generalized query letters to pretty much everyone who calls themselves an agent. Take your time and do your research. Make sure the agents you submit to represent your genre. Just because someone takes urban fantasy does not mean they'll take fantasy. Just because they take young adult does not mean they'll take middle grade. Read the agent's bio's carefully. That is your introduction to them, your chance to get to know them a little. Then read what they're looking for. If it isn't under their bio it is almost always under the submission guidelines.
Follow submission guidelines to the letter, literally. There is no room for error here. If the agent says cut and paste ten pages because they don't accept attachments, do it and don't send attachments. Those who don't follow guidelines are the first to be rejected. Be confident, don't talk too much about yourself, don't sound whiney, and don't forget to be polite.
You need an agent who communicates the way you want to communicate. Maybe you want an agent who is a hard copy kind of person who prefers limited contact via phone calls. Or maybe you want more of an on line person with a blog, Twitter account, Facebook account, one that's easy to reach in many ways. A good relationship all comes down to communication so make sure you and the agent communicate in the same way.
Not all agents are the hands on type who help with editing, story building, or brainstorming. If you need or want that kind of agent make sure you ask how involved they'll be in those processes. These are good things to ask at the offer of representation stage. Some list this type of thing on their websites. Explore their websites thoroughly to learn all you can about them. Don't have time for that? Then you don't have time to submit.
For more great tips check out this article by Writer's Digest: Get The Inside Track To Agents