Which SIM card to transfer from S4 to S6 TMobile

I use my Galaxy S4 as one of the lines on my son's TMobile One plan. I just bought a new locked TMobile Galaxy S6. I want to move my Tmobile account and data from my old S4 to the new S6. I want to buy a SIM card on Ebay. How do I be sure to get the correct one?

I know I should NOT get a prepaid one.

Should it be activated or unactivated?

My phone is locked.

Also, do I get one that is called a replacement or not?

What does that indicate about which SIM card to buy?

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