How to write a Team Build Process Template (2010) from scratch?

I know DefaultTemplate.xaml does everything needed. But I gonna learn team build this by creating an entire new build process from scratch. I need to know which activities must be included, in which order and so on. This must be using WF in Team Build 2010.

Many Thanks in Advance

UPDATE:

I found this link in MSDN that describes build definitions completely, but does not contain anything about Microsoft.TeamFoundation.Build.Workflow.Activities namespace.

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UPDATE 2:

I found a similar question in the MSDN Forums.

UPDATE 3: Found a link titled "Customize Team Build 2010". But this does not help more too.

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Take a look at the upgrade template. If you remove the MSBuild activity, you're fairly close to a minimal build workflow that still supports gated check-ins, etc.