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Buy a Tascam audio recorder (DR-40x if you wanna start a professional media careere down the line USED for just over 100 bucks.
Use the audio recorder to record segments of you rambling. Not something you will "fix later and cut and edit with 50 things" - but something that starts when you press record and ends when you press stop.. These bursts will come spontaniously, you will at least learn to unfilter yourself. Just pump everything you end up recording online, unless it conflicts with your morals.