I would like to add to Berka's excellent advice that you could ask for someone to act as a Beta-reader or co-writer if you want even more assistance than just critique. Keep in mind, however, that you need to discuss any reservations you might have with editing with your prospective beta / co-writer beforehand, and checking to see how talented a writer they are or how good they are in spelling / grammar / so on would also benefit you, since you don't learn much from someone at the same level as you. Well, usually, anyway. It doesn't always take someone better than you, just someone with a different perspective.
I became a beta-reader about 9 years ago for someone who is a very dear friend of mine to this day. I was able to catch all of her spelling mistakes, but she was a much more creative and talented writer than I was at that time. (I was just getting into writing as a hobby.) I learned a lot from her and she learned a lot from me. As time went on, there were less and less mistakes for me to find in her chapters and I was inspired to start writing myself, leading her to become -my- beta-reader. Though, honestly, I see her as my mentor now. I've also become a mentor to a couple other people. It was really fun. We've also co-written several little works together.
