Hey I am far from an expert on Japanese but i do know that there are many different suffixes for people such as -san which is one of the more generic ones. It is equivalent to English's Mr. others include kan- for children same-great respect and many others. I know that you generally use it for everyone else, but not if addressing yourself. You will want to get it checked though because i know this from basically reading wikipedia once.

No, lol, there is no ending put to last names, and that is correct. It is proper and formal to say things like Mr. Jones and Mrs. Adams. You might notice however that some names, like Peterson, end in son. But this is part of the name and dates back to when last names were not regularly given. So, to distingush one man from another with the same name, they would say "son of (father's name)" So James Peterson, was originally James...Peter's son. Over time, a lot of these became an actual last name. :)

Hi I think how to call Japanese people is a bit confusing for learners. Generally we use "-san" and you can use it after the first name and the last name. I usually recommend to the learners to use "-san". Other suffixes for people are "-chan" and "-kun". They are generally used after the first name and it is said that they are used for children but it depends on the parson. They can be used for adults depends on the relationships. For example, my name is Ryoko and some of my friends call me "Ryoko", some call me "Ryoko-chan" and the others call me "Ryoko-san". All of my nephews, nieces and children of my friends call me "Ryoko-chan" though I'm not a child because their parents call me the same. Please be acustomed to it little by little. I hope this was helpful.

I also should note, that Mr. etc. is used often in business and school settings. Among friends and among some informal business and school settings, people go on a first name basis. It's a good sign to know when to change it when they change it. But generally, if you are trying to be friends with someone from the start, you would start with your and their first name, such as: "Hello, my name is Ryan and what is yours?"

Please do not worry, Desiree. When Japanese people introduce theirselves, of course they say their name. Generally they say their last name, particularly in the formal/ business situations, so you can call them "last name + san". There are also cases that they say their first name, then you can call them "first name + san". (Please don't apologize! Me, too, sorry for my poor English. I hope you understand about it better than before.)