Now that you have something with which to edit images, you’re going to need a source for free images.
Whether it’s true or not, they claim to have the largest database of free icons in the world, and challenge you to send them the information if you find another larger. At the time of writing they claim to have over 410,000 icons in over 2500 icon packs.
The search function is very simple. Enter a word or phrase on the main page, and then you’re taken to the first results page with options to filter the results set in many different ways. You can limit your results by colour, size, background, image style, and license type. Or any combination of those.
You can also create an account so you can save icons that you’ll be wanting to use again in the future.
Enough description, go try Find Icons for yourself!