Here are some tools that I use for helping out with Pinterest. (Disclosure: Many of these are affiliate links, but I promise to only share products that I personally use myself and feel comfortable recommending!)
For scheduling pins:
For creating pins:
Canva-I use Canva to make all of my pins (and other social media graphics.) They have a free and paid version. I use the paid version because of the Magic Resize option, which lets me make the same image in different sizes optimized for each social media platform.
PicMonkey-an easy and free photo editing program for desktop
Additional Teacherpreneur Things I Use
Share-a-Sale-I use this for applying for various affiliate marketing opportunities.
Social Warfare Plugin--I use this on my Wordpress site More Than a Worksheet. It allows me to choose an image that I want people to pin. I can also write the description to make it easier for pinners. There are a ton of other things it has, too, like sharing buttons and stats.