Essentials - Newbies with different spawn/group/kit

Hi, I'm setting a server with background story.

I want my new players spawning in a different location so I can give them quests about the story. One of them will change his Group. I'm using Citizens and Quests to do so.

But I don't understand how to do it... I change the files through an online guide, but broke the plugin and had to start it over..

I just need for them to "born" with a specif Group and permissions. Spawn in different area and after a minutes, I don't know yet, click a sign and change Group e start the normal game like everyone else

Thank you for any help!
"Sorry if my english its not good"