You will need to install some repositories which have apps in them, but I would suggest that since you have very little knowledge about KODI, I would uninstall it and go to the TVAddons and install it. It is also a version of KODI, but already has a great selection of apps already installed and ready to explore. Then I would get familiar with this version of KODI and read in the KODI section of this forum and then you can add more apps to your version of KODI, or then install a fresh version of KODI and start over. The choices are yours to make.