Welcome Randy! That's a good question you raise. Short answer - local homebrew shops try to make things as easy as possible to understand for new brewers but, in doing so, sometimes give outdated or not completely accurate info on the process.
Weizen beers are best carbed and served as soon as fermentation is done. How do you know it's done? When you get 2-3 identical hydrometer readings, each a day or two apart. Once you get those identical readings, fermentation is done and you should bottle. Good luck!