Modelling objects question

Hi group,

I'm rebuilding a "Knowledgebase" (KB) i've created in Access to C#. This time i want to do it correct. OO and everything. Since I have no OO exp I'm asking you for help.

Functionality:
KB is able to:
- Store Notes, Examples, tips, URL's, attachments
- Add/ Delete/ update Notes, Examples, tips, URL's, attachments
- Print Notes, Examples, tips, URL's, attachments
- Search Notes, Examples, tips, URL's, attachments

Classes I think are necessary:
- Connect (to connect to the SQL database)
- Method: Open
- Method: Close
- Method: State
- Example
- Method: Select
- Method: Add
- Method: Delete
- Method: Update
- Note
- Method: Select
- Method: Add
- Method: Delete
- Method: Update
etc for Tips, URL's, Attachments.
- Print (parameter:item (notes, examples) to search)
- Search (parameter:item (notes, examples) to search)

I've noticed that this way I'm going to create a lot of duplicate code. Can anybody give me some tips on how to setup these classes the OO way?

SD.
PS: I've already started reading about OO....

First off , this issue requires reading on OOP but as a tip :
Put all shared methods in the base class and derive from it to children classes .