The order in which you attack the problem is important. Backing up between major steps will save you a ton of time when you are learning how to do this.
Scripting languages will always be a target of some kind of code injection. What you are learning from all this will serve you well in the future. Unfortunately, you are just paying your dues in running a forum. The more popular a script is the larger the target. WordPress has had a huge problem with this.
You will get through this if you take the steps seriously.
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