1. There are already far too many estate agents, most of them in no way qualified (though they may have a license despite this - don't ask). This is called the 'knicker shop syndrome' i.e. when someone does something new and innovative, and is a success, everyone else thinks they can get a slice, not realising that they are not actually generating any new business, but only stretching out what business exists. There is only so much lingerie you can wear at a time.
Do please think of something original. Remembering if someone else has thought of it, it is already far too late.