Well this is mainly do to the properties box.
If you push select on the object creator (on the left) and select the object on the map
and press right on your mouse, you will see properties of the object and there is nothing
in there!

For NPC's, there is a site on which you can create your own ---> http://efaraj.free.fr/nox/script/NPC.php

For monster you can download my beginners list from www.Noxforum.net ----> http://www.noxforum.net/index.php?topic=5378.0

Any other question can be answered at Noxforum.net also at my E-mail --->
Kayden95@hotmail.com

Hope this helped!