Convert 2 Magento 1 modules to Magento 2

I have two modules, one is a very simple module to calculate discounts and the second is a much more complex module which takes the design a user created in an editor, adds it to their cart, creates an image and saves it. Both modules are working perfectly in Magento 1 and you can get access to the site to see how they work. You will have a site in Magento 2 where you can test your code. The 2 modules in Magento 2 should work exactly and have the same functionalities as the Magento 1 modules. The modules to be converted have been ran through the Magento 1 to 2 module conversion script but it's a lot left to be done. Both modules are uploaded here. You can view it in action in 1 of the sites it's used in here: [login to view URL] (it's in Norwegian but it should be straight forward what to do, then click 'legg i handlekurv' green button to create the image and add the product to cart.