Notepad++ is great.
As was described earlier on this forum notepad saves all files in format of first opened file and this can be bad depending on what file was opened first and what file is saved now.
If you want to do any editing decent text editor is a must.
Other then that I can only recommend old method of baby steps.
Add one unit, test it in the game. If it works move to next unit.
If something goes wrong you will have smaller haystack in which you will have to look for errors.
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