I have no idea if there is a French equivalent, but in the UK you can buy an annual Photographers Guide, can't remember the exact title but you'll see it on sale in most bookshops. It lists by category, names and address' of just about all the magazines, agencies, businesses, etc. that are looking to buy photos, together with the type of photos they are after and the conditions attached.
As Lee says, it's a highly competitive market and there is no easy answer.
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