mods scripts (scripts inside the /mods/ folder on TFS 0.3+) can be very tricky for newbeginners to convert over to 0.2, since 0.2 has no mods support as of yet.
Mod scripts is basically a file containing multiple LUA scripts that relate to each other. You need to cut out these parts and split them into ordinary lua files.
However, most files in the /data/ folder is fairly easy to convert. If you for instance are trying to convert a talkaction script, you can just copy the script over to the same location on the TFS 0.2 distro.
Here its important to note that the xml markup is different (etc talkactions.xml that loads the LUA script is written slightly different), just follow the pattern that is used on the other scripts.
Now, when you run the server, chances are quite big that you will encounter error messages in the consoles. These error messages will explain what function is not recognized, and you can look for the appropriate TFS 0.2 names for those functions.
Most function names in TFS 0.3 are the same on TFS 0.2. But there are some exceptions, like doBroadcastMessage instead of BroadcastMessage and so forth. Small differences.
In the root directory (the folder where the .exe or config.lua is), you should be able to find a folder called "docs", in this "docs" folder you should be able to find a file called "LUA_FUNCTIONS" or something like that, open that with a text editor and you should see some coding examples, as well as a big list of compatible functions for that distribution. It's a nice place to look for correct function names for that corresponding distro.