That's a cute print that you chose, I like it a lot. My first sewing project on my serger was to make pillow cases for my bed too. The cases came out great and it got me used to threading the serger which seemed pretty involved at the time. The great thing about pillowcases is that they can be made up very quickly on a serger and you can recycle other fabrics like old sheets, tablecloths
or just bits of lightweight cotton that you have hanging around. It's a very simple and satisfying project. I have about 4 different sets of pillowcases now that I've made. Lots of fun.