where do i go to download maps please help
Personally, you might wanna try looking the Community Creation’s forum. I just find maps and what not through b.net and xbl, but I would probably try Community Creations seeing as you’ll probably have better luck there.
If you want to find good user made content, http://www.forgehub.com has a very large selection of quality maps and game-types.
OR if you are looking for a specific map you can use the in-game file browser or go to the bungie.net file browser to find it.