Welcome! 
Take a look at those sites:
https://docs.unrealengine/latest/INT/
https://wiki.unrealengine/Main_Page
https://wiki.unrealengine/Videos
First of all start with the basic video tutorials and after that directly jump right into a own project -> best way to learn. During the learning process you will have some questions which you can post into the forum or answerhub -> we are always here to help 
For free stuff, take a look at the marketplace, :///, ://www.blendswap/ and this section: https://forums.unrealengine/forumdisplay.php?12-Community-Content-Tools-and-Tutorials