With a Tasks list an Assignee field (usually) exists which is used to set to the user for which the task is assigned. But: it could be any field if type 'People and Group'. So when you say you want to get a user's tasks, you need to be aware of what column
is being use to capture the assignee.
Ok. Had to get that out of the way since you said you were a novice. :)
So to retrieve the rows out of a List for the 'current logged in user' you would use the <UserId/> CAML token when querying the List. Look at this for an example of how to use this token in CAML:
There are several examples here in the forums and documentation on how to use the Lists.GetListItems operation. That together with the reference above should get you going.
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