How you want to organize and load your keys is up for you to decide. The first step is to determine exactly what you want to do, then you will be able to ask specific questions about how to do specific things. If you are not specific, people are much less likely to help you. It is not easy to give advice to do "something".
To display a key, use the Dictionary.Get("key") expression. For example,
On Trigger -> Text Set text to Dictionary.Get("input_Name").
This will set the text object to whatever was saved in the dictionary under the input_Name key.
To add all keys to a listbox,
On Trigger
Dictionary For Each Key -> List Add item Dictionary.CurrentKey
To use the list to select a key,
List On Selection Changed -> Text Set text to Dictionary.Get(List.SelectedText)