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Research a company that is hiring or sign up independently. They take a percentage of the money but they ( at least most of them ) do provide value to models such as promoting the model within the site, technical support, training and issue copyright complain notice if any material is leaked onto the web.
Some studio will even sponsor equipment for models who work from home. Models who work at the studio itself will benefit from high end equipments such as HD remote cam ( the good one cost over 1000 if the model has to buy it herself ), studio lighting etc.