>> If I change $top= in the URL call, no matter what I specify, it always returns 1 link for a result.
May I know what URL are you using? Please try
https://api.datamarket.azure.com/Bing/Search/v1/Web?Query=%27develop%27, it will return a lot of results. Please note the "/Web" part in the URL. This is how you get results from web searches. If you use "/Composite", you may only see
a single result telling you how many results you will find if you do a web search on this keyword.
>> I don't know where to find that control pane type page
I'm not aware of the control panel you mentioned. Do you mean the "Explore this Dataset" feature on the Marketplace portal?