If you need a guide, do something else. You're going into an established niche with 30+ years of experience. It's no longer as simple as slap a photo on Blogger; yeah about 25 years ago I did that and made $20-50/day posting one photo. It was literally a blank page with one photo posted every day and a single ad banner. Eventually I added a search box so you could use it as your homepage. Those days are long gone.
These days, how is your site going to compete? Making it for Germans isn't enough, there's tons already. Is your site going to be faster? larger? what's the reason for me to visit you vs going to an established website? That's the problem. And do you know how to run a server, install Nginx, Apache, PHP, IonCube, MySQL, FFmpeg, ImageMagick, etc. etc. No? Guess what, no way in hell you're going to compete. Sorry but there's a reason all the people trying to do port tubes with Wordpress fail, they're 10 years too late where that works.
There's a lot of simpler ways to make a buck online, so unless you legit want to get into adult entertainment, look elsewhere.