2018 tax year how to send

ok, so I printed out all papers, both fed and state.  please correct and teach. 🙂  I need only to send Federal W2 docs and Federal papers to Federal, right?  When sending to State, I need to send all paper works, both Fed and State but only State W2, right?  Because it says "When mailing your return, you must include a copy of your federal income tax return (including schedules) and any income tax returns you filed with other states."  thanks in advance.