If I want to automatically sync my subscriber lists with my own customer management software (sql server), How do I get started with the API. I've downloaded the API and the C# sample. I am a C# .net developer with many years of sql server. In other words which API methods apply to performing the sync up.
You would generally be using all the subscriber.xyz methods - adding, resubscribing (with updated fields) and unsubscribing people from your list as their status changes.
It all depends on what you actually need to do though, of course, the methods are pretty clearly named and explained at http://www.campaignmonitor.com/api