Answering your questions completely would take a very long response because of a number of qualifications, "if" conditions, and related factors that would apply. I recommend that you do some reading on the subject. Either get a good book or do a web search on "llc vs S corporation" or both. Or, for the tax issues, pay an accountant to have a sit-down with you and discuss your specific situation.

For example, your list of roles is incomplete but does not provide enough information to determine tax status of the roles that you list. Maybe someone else can provide more general information to you, but I'd be concerned about me making assumptions that might cause me to give you bad information with the question as stated.