State tax filing

Thanks, a lot @rjs for the responses.

I have following followup questions about filing extension for NJ. I prepared my return and I am going to get a refund.

1. So do I still need to file the form NJ-630 (form for extension request: https://www.nj.gov/treasury/taxation/pdf/current/630.pdf).
2. If the answer to the above is yes can I do that online? Given that I am a first time filer in NJ and I was a part-year resident only.

Thanks,