Hello
Have a look at the Converter SDK forum:VMware vCenter Converter SDK
There is no step-by-step documentation but there is new sample code (Re: Enhanced C# SDK samples) with comments in it that can help you.
The basics are that you have to construct a job spec in order to start a conversion job. You can create a scheduled job which will start a synhronisation task in the future. If you want to re-schedule, you need to modify the job (look for ConverterOperation.Synchronize). If you want a delayed start, the API doesn't provide for that, you need to use an external scheduler which will run the program to submit the job.
HTH
Plamen