SolvedHelp please!

Hello guys, i haven't been playing dayz for a long time, and back when i did. I use to use scripts/hacks everything you can imagine. But my hacker dayZ are officially over. And now i need some help from you guys. I'm going to buy a new copy of Arma 2 OA, but what should i do before i change it. How do i change it. I need some guidelines, small tips. Everything. If you have done this yourself please tell me. I really need the support.

Thanks and have a great day!

Or what key should i even get, the Arma 2 OA or Arma 2 CO? Steam version or bundle key?