Filter on Custom Fields

in wordpress terms - I want to be able to filter the available agents based on a custom taxonomy which works like a TAG. ie something other than the core filters of Location, Date/Time and Service being able to filter based on Extra Services would work... but ideally I can assign a custom taxonomy (like a TAG) to an agent and then filter out all agents without this tag -- the TAGS which need to be set independent of services, locations, extra services and categories are in my real world use cases are: Tour Guides - languages spoken and vehicle type(sedan, SUV, minibus) Models - hair color, height, eye color, waist size, bust size etc I could use extra services - but need the ability to filter on the extra services - not just the service it may seem like a difficult requirement but it's trivial in wordpress terms to be able to apply such filters