After the second time loading, no more units will appear from the buildings...
Excerpts taken from Tricky Tiger's Editor Manual.

For the terrain it is best to use Raise Or Lower Plain option. You can then edit it with the Create Plateau option. When selected you can also use numbers from 1-9 to select size of the area you wish to modify.

Also check out the Basic Editor for creating CII Skirmish Maps that is on the Main Page.

P.S.: CTRL + F8 keyboard combination will be your friend when adding various fences, walls, and other various eye candy. BUT DON'T USE ANYTHING FROM THE OLDMOST SUBMENU. IT WILL CLOSE THE GAME.
Also important is knowing that Create Plateau option does not work with Scroll Lock ON.

Cheers
aiidii

For villages it is best to use those from the SELFRA submenu. Using those from the Nations list is also cool, just keep in mind that neutral dvellings, markets, towncenters, academies,... can be destroyed later in the game (yes, I've tried). Though I wouldn't know if neutral mines can also be destroyed, haven't tried that yet. Buildings from the GORAUS submenu can not be destroyed later in the game.

Roads in towns eh? From my experience it's try and try again. I know there is an option to overlay the map with a grid, but I don't know if this has anything to do with making road systems for towns or something else (I suspect it's the latter). Daddio and EbelAngel should know more about that.

For deleting sprite objects from CTRL+F8 menu you can use Erase Trees & Stones option.

Make terrain, place villages, town, extractable rocks, complete road system, blocking options, before you paint the terrain with textures. From my experience it is best to have road system completed before you paint the terrain.

You can go to the CII Skirmish Maps list and download my map called Dogs of War. Download it, copy the file from the Missions/Skirmish folder into the Designed folder and then run it through the editor. It should give you a good idea of what and how and where. That's what I did with all the ingame skirmish maps to give me a better idea of the editor. Plus the Tricky tiger's Editor Manual was of great help.

Cheers
aiidii

Again from Tricky Tiger's Editor Manual:
...The first option is for iron, the second for rock (not interesting), the third for coal and the fourth for gold. We're not interested in any of the following ones...

When placing resources for the mines it is enough to use the smallest amount possible. One click with number 1 for the size of the resource is enough. The buildings for mines are located in the Nations submenus. It doesn't really matter from which nation you choose them from.

P.S.: If you haven't already, print out the Editor Manual. That way you'll always have it available for a quick look.

Cheers
aiidii

When you elevate terrain use the F5 button to check on blocking. Remember that holding CTRL while using additional blocking options will create little crossed red circles with horse icon inside. this means soldiers will move slower on that terrain. Use that for dense forrests.

P.S.: You have to select Cossacks II: Napoleonic Wars checkbox that is on the left side for install. And don't forget to select your game folder too.

Cheers
aiidii