What to do with an iphone 5?

I found an iphone 5 for Verizon. And I want use it but don't know what to do and I don't even know if it works with t-mobile

It won't work for t mobile unless you jailbreak it and factory unlock it. Then you can use any sim card you want. Evasion is the best jb program, use it if that's what you want to do