Step 1: Starting Out with Tinkercad & Importing Images
If you want to search the web for a file to import into Tinkercad, you'll need to search for a .STL file type. There is a link on the right-hand side which says "import" so you can either upload the file or import directly from a URL.
Once imported, you can click on the image and move it around and increase the size to your specifications. You can also rotate it and move it in all sorts of directions.