Can I use any sim to activate/set up straight talk iPhone 5s?

I recently ordered a straight talk iPhone 5s from swappa. I plan to just use it as a Wi-Fi device but my question is, can I use any sim card for the initial set up or does it have to be specifically straight talk sim. Also does the sim have to be activated and working? And after the initial set up and activation can I simply remove the sim card and the phone still work as a Wi-Fi device? Sorry this is my first time buying a phone.
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StraightTalk phones are unlocked by default so you can use any SIM card with the phone like if you have T-Mobile then you can use T-Mobile SIM, if you have AT&T then you can use AT&T or whatever your GSM carrier is. You can use a new SIM or you can use activated SIM. You can use the phone with Wi-Fi only, no problem at all.

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