Looking forward to seeing a new face, hello and welcome! For some of your questions - I think a lot of stuff is left 'unsaid' and is usually up to the current writer's discretion. Currency is usually left as standard 'gold' - races might have a special unique currency if you want but it isn't hard and fast. You didn't ask about it, but there is a common language, but most of the non-human races feasibly have their own tongue.

I look forward to seeing you write here!