As a beginner drummer, there are a few essential items you should invest in to start your drumming journey. Firstly, you will need a drum set consisting of a snare drum, bass drum, toms, hi-hat cymbals, a ride cymbal, and a crash cymbal. Additionally, you will need drumsticks, a drum key to adjust the tension of the drums, a practice pad for quiet practice sessions, and a metronome to help you keep time. Finally, investing in drum lessons or instructional books will greatly assist in your learning process.