The script was designed to be run standalone, so by default it will download all new videos that have not been downloaded already. If you provide a name or episode idea it will focus on downloading just those.
If you run the script with -help it will show you all of the options and their defaults. If you want to use mp4 files, then you will have to have ffmpeg.exe installed (I am assuming it is in the same place as where you are running the tablo2 script), otherwise it will only be able to produce the raw ts files.
I recommend a setup like this
python tablo2.py -db:tablo2.odb -history:tablo2.history -mp4 -ffmpeg:./ffmpeg.exe
which will cache the metadata from your tablos in the tablo2.odb file, record what has been downloaded in tablo2.history, default to mp4 and use your local ffmpeg. You will probably want to change the default location for tvshows and movies as well.