What can and can't an assistant do?

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My wife and I would like to open an office. She has a license and I will be her assistant.

I anticipate, as her assistant, to be able to inform customers of property details, record contact info, gather info about prospective listings, follow up with customers regarding bid placement acceptance or decline, place signs in yards.

She will show houses, sign contracts.

Also, would we be allowed to open our own office away from the agency that she works for? ie...She works for C21 but uses her own office with a C21 sign on it.