>>323262007
>do you spawn in a hub world
you spawn in an empty "home" world, which you can set to any world later on. you will always start off alone in a home world, regardless to where it is.
>and then decide what world you want to join?
yes, the default home world room has a few portals to some hub worlds
>are there any strict roleplay areas 
there is probably people out there who organize rp, but usually rp worlds work as well as a second life rp world would; some semi-serious rp but mostly people talking and hanging out