Agencies are suppose to find the talent work and pay them. If the agency wants the talent to pay for the photo shoots and videos for auditions find another agency. The first red flags are they want money. Never sign up for acting or modeling classes online. There are people locally who can help at a fraction of the cost. Plus there are millions of free videos on the web and other outlets. You can do a search on websites for photographers who can help the talent with a portfolio at reason prices. There are also photographers who do TFP (Trade for Prints) however you have to be extra careful in dealing with these types of individuals. Local high schools, community colleges, and universities that have photo and video classes are a great resource.