I had no previous experience in law either when I was applying last year so my strategy was to be completely honest and explain from where I developed my interest in commercial law.
What I used to was start with a brief sentence highlighting that my goal would be to help businesses with my legal knowledge and sort of quench the gap between law and business. Subsequently, I used to talk about (very briefly, usually one to two sentences) about how I used to help my mom when I was young translating business contracts from French to Italian for her and seeing the impact that I had pushed me to pursue a career in law. I underlined how the commercial and legal world was the only sector I could develop my advisory and communication skills to become a successful business lawyer.
Additionally, I linked it back to one/two experiences I had with start-up companies where I was exposed to the implications of the law on small businesses. I also included an experience in a law firm when I was in high school too, even if it was very brief.
As a non-law student and an international student with an undergraduate degree outside of the UK I was really scared of using this structure, but it ended up being extremely successful and interesting to graduate recruitment. Every single AC I have attended, graduate recruitment and partners has remarked how interested they were in reading how my interest in the law developed.
I hope this can help you and good luck with your application!
@lawyerinzootopia