I'm confused... I've heard there are tens of thousands of characters in the Chinese language. I've heard that an educated person in Chinese needs to learn around 6000 characters? How is a person supposed to remember over 6000 letters and then use them in words. That sounds crazy! I'm a little confused on how the language is structured. In English there are 26 letters and different combinations make different words, but I've heard in Chinese one character can mean a whole word. Also how is Japanese structured? Is it the same as Chinese or is it different.

English is 26 letters.
Arabic is 29 letters.
Chinese is ....??????

Thank you