Hi,
New to Arduino, and need assistance to purchase the correct hardware.
I Need arduino + ethernet shield + serial RS422/RS232 port + digital I/O.
What would be a good hardware to get started?
First start with these links.
Could you take a few moments to Learn How To Use The Forum.
It will help you get the best out of the forum in the future.
Other general help and troubleshooting advice can be found here.
Then describe the project you have in mind.
That all depends on what your intentions are.
Paul
Yep. Clearly an XY problem! 
ronnen77:
What would be a good hardware to get started?
Any hardware.