Default I have heard there is a mail client and there are other cool apps, too. Where can I f

To install all those apps you have to add a new repository. So type into a Terminal:
sudo add-apt-repository ppa:ubuntu-touch-coreapps-drivers/daily && sudo apt-get update
Now you have to install the right package:
sudo apt-get install touch-coreapps && sudo reboot
After the reboot you have those apps installed!
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