If you Google or search for "free social media icons" on Pinterest, you will find all sorts of free social media icon images. Find the icons you like and follow the steps on THIS POST to add the icons to your blog sidebar. It worked for me the very first time, and I am totally not that HTML savvy.
If you have any questions, I'd love to help! Leave me a comment or send me an email. And be sure to send me a link to your blog when you have added your new social media icons. I'd love to see them!