First 1: Always be nice to people, even if there not nice to you.
Second: Always have a good preview map cover
Thirdly: Always have a valid description, if you need description help go here:
http://www.hiveworkshop.com/forums/tutorial-submission-283/importance-description-127031/#post1117301
Fourthly: Constantly update it and making it better is good, but if you are going to update the map, make sure the update is huge before doing soo. Minor unnecessary changes can annoy people.