There is probably no library folder assigned to Font Manager. To solve this, click on the setup-tab at the top of the Font Manager panel. Then click the settings-icon that looks like three sliders. If you then click the folder-icon you can assign any folder on your machine as a library folder. Make sure your typefaces are in this folder in the right way as described in the User Guide.
Also make sure that the option 'Allow scripts to read files and access networks' is enabled in the After Effects preferences.
Your typefaces are still in trial mode. They only support A, B and C for testing purposes. The rest will get replaced with question marks. To unlock the full character set, click in the little info-icon next to the typeface name, click 'Register' and enter your license key.