Below are various links and resources that were of use to me, and will likely be of use to you as well.
Pexels is an image site which has royalty free images. You can find them here. http://www.pexels.com
Another useful site for images is Pixabay They have tons of royalty free images as well. http://www.pixabay.com
Investopedia is a great tool for almost any financial information you are looking for. They have some great definitions of any term you can think of. http://www.investopedia.com