Lucy Dalley

I am just starting as a "sole trader", as a Yoga teacher along with my PAYE job. I've got a couple of questions. I am a little unsure as to when to register. Do I wait until this tax year finishes in 2025 and then register, or do I do it sooner? I have searched through many pages here, and other Internet sources but I am unable to get a confident answer to this. I am also probably registered as Special Section D. I do not need this, and it was placed on my record automatically in 2015. Is it worth me getting it removed if this is the case? Thanks in advance.