To all the people saying Esperanto is useless, it's not.
Even if you don't plan to use Pasporto Servo, talk to people online, read Esperanto Literature, or attend the meetups/conventions- it is good for learning other languages.
Learning Esperanto for one year, and then French for 3 has been shown to give you greater fluency in French than a whole 4 years of French.
So if you are merely interested in learning ANY language, it makes sense to learn Esperanto first.