What do I need to know before playing BioShock 2?

There are 9 things to know before you enter BioShock 2. Become a successful hacker. If you want to get an extra boost, stop the needle in the green or blue area. There is a radio that you can listen to. You should choose the right weapons. It's time to take on Rumblers. Make a deal with the Big Sisters. Take care of Little Sisters. You should buy the right tonics.