My family has T-mobile phone service, and i would like to get an iphone 5?

So my family has T-mobile phone service, and i would like to get an iphone 5… I don't have Data, I typically just use Wi-Fi. But id like to buy an unlocked iphone 5 off of craigslist specifically for T-mobile service. So what i'm asking is, 1) i know i will need to get a new sim card, but even though i have no data will they still give me one? 2) will i have to pay an iphone service fee each month?

You will need to pay a data plan.