Visit
http://www.chinarice.org (my site) for the free advice. Don't hire me or anyone else. Just read the advice. Learn to edit your own work. Make it the best you can, put it away for a while, come back to it with fresh eyes and see more ways to improve it. Repeat. Repeat. And so on.
Once you can't find anything to improve, find willing friends and/or critique partners who will give you advice. On-line critique groups are free. You critique me, I critique you...
Whenever a reader suggests a change, you don't have to make it. Just think about it. Especially if multiple readers suggest the same thing. Now ask yourself why. If it's something you don't mind changing, go ahead. If you can't change it without sacrificing what makes the novel special to you, stand your ground, but be grateful for the advice anyway because it tells you what reaction to expect.
All authors worthy of the title break rules, but they do it deliberately, never out of ignorance. So read, and read, and read some more. Learn what works for the masters and learn what doesn't work for the idiots. Who are the masters and who are the idiots? Whoever you say they are. You're an author!
If an agent says you need to hire an editor, be very leery. If that agent then recommends someone, now you're probably looking at an "agent" who gets a kickback, and who has some other ways to part an author from his money, and who maybe has never sold a book because he's paid by authors, not the publishers who are ultimately paid by the readers. Your readers. If he gets paid without finding you some, he's a crook.
Never pay to be published. Never. Never pay an agent, never pay a publisher, and be very leery about paying an editor. I charge two cents a word, and sometimes I throw in a discount. When the prices get higher than mine, you're getting scammed.
But if I understand you correctly, you're working on your first novel and it's not finished yet. Please please please don't think about editors. Write it first!
Congratulations on coming this far! Most people who "want to be authors" never write. You write. That's the one part of the process that nobody can do, because only you can write like you. That's your voice, your mind, your heart, your vision, on that computer screen or that paper. Be very proud of that.
Good luck! Keep us posted!
Best regards from Thailand,
Michael