Agent asks you for money up front. Yes, I know I just said this, but it bears repeating. Do not pay any agent, and especially don't pay anything in advance merely to have him represent you. Agent won't give you the names of his clients and recent sales. Always ask for this.
Agent recommends an editorial service.
Be very wary here. There is, however, a common scam where the agent recommends an editorial service. There's a good chance the service is paying the agent a kickback to make that recommendation. Agent has contacted you. Agents don't need to go out of their way to find clients.