Sorry to hear this has been challenging - were you trying to do something like this, where you select a row in the table, and then make another API request with data from that row?
https://retoolhacks.retool.com/embedded/public/17eebce9-96f3...
If this is close to what you're looking for, you can import this sample app from this JSON export:
https://gist.githubusercontent.com/kwhinnery/4fed2a80788f429...