Can someone help to query Google analytics to track a specific user behavior and usage pattern?

Currently I pass user id’s to GA as

_setCustomVar(2, 'id', id, 1);

This is session based.

But I am yet to master how I can utilize this to view usage pattern & behavior for the passed id. Say, I need to understand the visualization flow for one id or the page view count for that id etc

Rephrasing, can I filter all existing reports for a specific id that I can select?