Welcome @Kritischer !
I would like to add, that I also understand your confusedness. But if you look around in the forum, some users might already stumpled upon similiar issues and I’m sure you’ll get the most out of it. In Bliss the apps you already installed should drop somewhere to the various homescreens - you’ll find different varieties of launchers on the inbuild appstore or F-Droid or even Aurora Store. I do not know what you’re used to, but the most common launchers are available.
Just recently there was a thread about launchers. So some users and myself shared some experiences with different launchers, if you want dive into some Bliss alternatives: Alternative Launcher.
Greetings