I assume you're referring to the David Barr article (or Barrticle), I believe they have stopped adding the ingredient Dave was discussing so I'm sure you'll live
Stick with the basic versions and you'll be fine, these generally refer to the liquid versions
In general, consider protein powder a food substitute. You should take it when you either are not hungry or don't have time for a solid meal.
Other than that you could look into fish oils, more for general health, but most importantly look at your current eating/drinking habits. This is where you will get the most potential for improvements.
A creatine supplement is fine to take as well as a beginner, since it is relatively cheap, but you likely don't need it yet.