Project Design Help [Advice Needed ... Please]

First of all, I'm a noob, so be nice!� 

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About 33% way through my project I am beginning to see potential design flaws.�  Allow me to attempt describe the structure of my project (my understanding of n-tier design(3 tier)):

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[Current Structure]

Presentation Layer:

1)�  Displays the visual components to the end user.

2)�  Creates instances of the Business Logic Layer to retrieve data from the Data Layer

3)�  Data is retrieved from the Business Logic Layer in the form of a DataTable or DataRow

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