How to create a web app with data from import.io

I am fairly new to web dev and I know the basics of html, css, javascript and jquery, so just Front End. As a challenge to learn more I want to create a web app that does the following:

1. Get the pictures, description, link and price of rent properties from various sites. For web scraping I would use import.io to get the data I want and then query that API to manipulate and show the data.
2. With this data I want to create an aggregator app that would show all the properties querying the import.io database let's say every 15 minutes to get new properties.

My question is how do I do that? What languages I need to learn? Or is just a matter of getting the data from import.io API in JSON form and then displaying it in html?