@theumann the Titanic case is one of the classic machine learning cases and discussions and solutions are out there, also it seems in knime.
Since this is an assignment and from what the descriptions imply some more advanced data preparation might be expected
You might have to tell us more about your specific task and think about how this will not just be a copy of an existing code.
One idea could be to transfer some advanced preprocessing to knime and discuss them.
You can always upload a workflow to the KNIME hub or the forum (How to Best Ask For Help on the Forum). And as @ArjenEX has said it would be best to ask specific questions.