I'd suggest the best way to develop some camera/shooting skills would be to start watching tickling clips and try copying what you like yourself. I hope you really like to watch these lovely ticklish emotions yourself so you will try to make it as good as or better than other ticklingvideomakers.
As for the gear, can't help you much, because we use several very expensive cameras, lenses and lighting. As we also don't make our tickle therapy content full time 🙂 Some of us are tickle therapists, and some are professional cameramen and videomakers. And we all just love what we do 🙂
My educated guess is that we spend much more money on shooting gear than anyone else here among the producers.
My advice: cameras are less important than good lighting, setup, angles of shooting, composition and color grading.