there is nothing to be stressful yet, relax and have fun, using audio interface is as easy as learning to walk. Read, try, do, record, voila..recorded music!
USB audio interfaces, popular brands include Line 6, M-Audio, Presonus, Apogee, Focusrite, Tascam, etc. Budget $120 to 200 depending on model, secondhand, for the lower end models.