The "Iconify" plugin makes it easy to insert free icons.
Iconify
Search for "Iconify" in the Resource Plugins and launch it.
Enter the icon you want to find in the search bar and click "Search Icons".
Specify the color and size, and click "import icon.
The icon will be inserted as a vector image, so you can change the fill.
By the way, if you already know which icons you want to insert, you can add multiple icons to the design by pressing "Command ⌘ + Shift + K".