The script viewer usually pops up when you touch the key "Scroll Lock". Simply press escape when that happens.
I asume u touched that key by accident. if not, it might be that one of the maps you downloaded is faulty or does not fit the game version you are running.
creating a lan server is pretty simple:
Ingame
1. >> choose local ( TOP)
2. >> choose Local Network ( right side)
3. >> press create
4. >> choose Gaem Mode ( timeatack online will do pretty fine )
5. >> choose maps
6. >> start server
it should instantly start and your second Kid should be able to join it on your local Network.
to have a good start, get some maps: (unzip in maps folder which i asume you allready have found)
160 Maps whic are relative short in length to learn the game, some easy, some hard, some for advanced players, (good to learn alll technics that are in game)
all of those maps can be found here ofc, i jsut zipped a bunch of them. the preferable way is to choose them here and download them or map packs, which are rare unfortun. but will be more when the game gets a least the touch of "age"
Cs-esport Maps
when you want to add more tracks, stop the server, and as extra step choose matchsettings then - to have all the added maps included. (file is saved automatic, u nee dto include it of course to keep the tracks you added before.