Al characters in this campaign start in NY. They should be based there or perhaps be there for an extended stay for business or study.
The rules for generating characters are in the quick start Call of Cthulhu rules free from the Chaosium web site
The skill list for the professions aren’t there, but you can easily make a CoC character based off of quick start and just check the occupational skills with me at a game session. You can also ask me for the skill list for a specific occupation.