Fixing a cut electrical cord is fairly easy. Just research and give it a try. As mentioned, you may need to get replacement components for the cord at Sew-Classic. It looks like most other items included are pretty complete,and your Wizard is a low shank, Model 15 machine which makes buying additional attachments easy.
That is a really nice looking Wizard zigzag machine you have there. Don't be intimidated by teaching yourself to do sew. I have five granddaughters and one grandson, all under 5 y.o., and I taught myself to sew with two friend lessons, a bunch of youtube videos, and a desire to sew some special items for my grandkids. Good luck!