You'll only get an agent once you're good enough. For now, you need some good feedback.
Search for specialist writing sites where you can get honest criticism of your work. Absolutewrite.com is a good one. You don't need to upload the whole thing: just a few pages will be enough for people to get an idea of your level of expertise.
Be very wary of services which ask you to pay. There are lots of scam agents, editors and publishers out there. Don't sign up with anyone unless you're sure they're legitimate.