The syntax for the command line is:
ConvertDoc /S{Input File(s)} /F# /T{Output File(s)} /C# [/M#] [/G] [/V] [/R] [/L{LogFile}] [/B{LogToJobFile}] [/I{override initialization file}] [/E] [/A#] [/W{PDF File Open Password}]
Items above enclosed in square brackets “[ ]” are optional, all other ‘switches’ are required. Therefore /S, /T, /C# should always be specified on the command line. There is one exception however, and that is when /G is specified, the /T switch is not necessary.
You can include or exclude spaces between switches and parameters. For example, "/C6" is the same as "/C 6". For long file names you may be required to use double quotes. For example, /S" C:\Program Files\MyApp\MyDoc.DOC".
Next, read about each command line switch and then dive into the examples.
More:
Complete List of Command Line Examples
Command Line Switch Specification
File Type Constants Specification