As said above, keep revising the work so you're really happy with it yourself. Then have others read it and when they're really excited about it (genuinely) then you're getting there.
Now you've done about ten percent of the work. I've never had an agent but it seems that anywhere except NZ and AUS that is a real posibility. There are many threads here talking about contacting an agent for you to read.
I've published in Aus, USA and Canada by contacting the publisher direct. First I used Preditors and Editors to make sure I wasn't contacting the wrong people. Then I made a list of publishers in my genre who accept contact from the author direct. I find it's essential to study the publisher's website. I send exactly what the publisher wants, nothing more, nothing less. I spend a lot of time on the communication. If my submission sounds amateurish, what can they expect of my manuscript?
Ask your library, or buy if you're filthy rich, a couple of books on preparing literary proposals. Make sure the writer has had a lot of publishing experiance. In that way you'll get an insite into the industry.
And keep your fingers crossed. And god luck.