Display Results/Data Quality problems/Log Data to the user

Hello @whizkid,

welcome to KNIME Community!

What you are looking for is logging mechanism which you need to implement. There is no proper way and it depends on your workflow design and logic. What is usually used are Try/Catch sequences and Table Validator nodes - Table Validator & Table Validator (Reference).
See this topic for example: Knime Logging Mechanism

Bonus answer:
Parameterization in KNIME is done using flow variables.
See here : https://www.youtube.com/watch?v=EvcRiQea3FA&ab_channel=KNIMETV

Have a nice day,
Ivan

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