Mtb'r with a new Garmin 1000

[Phread]

OK.  I admit it.  I have no idea what I am doing.  (Just a warning).

I am trying to find sources for trail maps (mainly MTB) that can be imported into my new Garmin.  I was able to use MTBProject as a source, and got a map of the Elizabeths Furnace area to display. 

Are there any other sources that I could use?