Send us the map by mail (the contact address is on the web) or upload it somewhere and put a link on this board.
There is a manual for the map editor that may help you a bit, but is quite outdated. It may be a good idea to take a look to existing maps as well as a reference.
Custom objects are objects that depend on the tileset, you don't know exactly what they will be, so use only a few of them for decoration. Most of the objects should be of the types 1 to 5, that have predefined object (1 is a tree, 2 is a dead tree, 3 is a rock, 4 is a bush and 5 is an object to be placed near a river (even if the model is not done yet))