Learning Esperanto

So after diving in to a used bookstore 30 miles from where I lived, I found an old text book from the 50s about esperanto! (SCORE!!) So anyways, after 2 minutes of reading, I came up with my first original Esperanto sentence: Vi estas kankro! (You are a crab) Okay, so after that useless sentence, and 4 more minutes of reading... I have come to a dead end of sorts. When I use a name in esperanto as a direct object, do i add an o and then an n or do I just leave it as it is? For example: Is Bucxu Bill right? or is Bucxu Billon right?