Tableau will come to your organization, at a cost. There are many other choices out there, and Tableau has a list of Partners as well. Your Sales rep can also help direct you.
Otherwise, there are tons of training articles and videos on the Tableau website--as well as several YouTube videos from various folks. Additionally, some users of this forum have blogs that are great for learning Tableau. If you're talking about one person learning Tableau, using this forum and the other resources I just mentioned will be very helpful and you may not need someone to come out. If you're talking about training for an entire organization, you may need outside help--or one person at your organization can become the "expert" and they can help train others.
For future reference, the title of your question is what we see in the forum list--you will want to try and use a descriptive title in the future to get the best possible response(s).
Welcome to the Forum, and best of luck!