How to get an iphone 4 from verizon to have straight talk service

1st My first phone (Samsung Galaxy Centura) got water damaged and i didn't get the insurance so i needed to get a new phone. My service ended today but i have a 45 dollar card so i'm okay with that. My friend is giving me an unlocked verizon iphone 4. Do i need to cancel my account and make a new one for this? How do i get it on straight talk do i need to buy a sim card for it to work for straight talk? I know you need to jailbreak the iphone for mms and picture messages for Straight talk. How do i get the service for straight talk then & Wi-Fi for my phone? How do i call them and tell them i won't have the first phone but i want my number transferred to the iphone and i will have that on my plan instead of the samsung galaxy centura? If someone can give me answers super fast i would really appreciate it & in good detail so i know what i'm doing.

You can most likely change the Sim card

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