posted 02-19-2002 11:27 PM
First of all, what Wad are you using ?Tut.wad / Catacomb.wad and so on...
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Example, if you use Tut.wad
1 - Build your room, put your textures and lara in it like you did before
2 - Go to project drop down menu ( top left corner ) Select, "output wad" a small window will pop up
3 - Select from here Tut.tom if you use catacomb.wad you choose Catacomb.tom, then he ask if want to overwrite, you can click yes cause no big deal when overwriting tom files.
4 - The editor will automatically output everything into the tom file, ( your editor will turn into 2d mode, you will see you room white and blue ) Now he says "wad outputted" click ok,
5 - Close your editor and run Tom2pc.exe, this program will convert your tom file into a tr4 file ( the real playable file )Press add button under "edit script" and select Tut.tom from the list. Now press "build all
6 - The converter will start writing some information, dont worry he is converting, after the message "build all complete" appears your done, close your converter
7 - Run Tomb4.exe, choose new game > select Tutorial level, and voila 
Hope it was clear enough
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The best thing and last thing is to try ( ^_^ )=b