Here's what I've seen. First you’ll need a service provider (you can’t really avoid it) we tried grouhub,Manuel the guy was very kind. 500€ for the incorporation and he referred us to get the bank account . On the other hand, don’t incorporate too early. If you’re still validating, you’re just paying overhead for nothing(180€/month).
On initial capital: you can set it at €10k as it helps if you plan to structure/share ownership more seriously later, but plenty of people start smaller and adjust when needed.