If anyone could help or give ideas it would be great
Paragraph One- Focus on education
Paragraph Two- Write about additional experience
Paragraph Three- Talk about the reasons why you want to study law at university
Paragraph Four- Reference list of books
Then do a mini introduction.
Avoid cliches such as "ever since I was young/since I can remember..." because they see it all the time, and they honestly don't care when your interest began as long as you can show that it's genuine. Just write down your thoughts, and you can edit them later; I actually got rid of my opening line after my first draft, so the second sentence became the opening. Don't think of it as a linear process in which you write one paragraph then move onto the next and then the next, because it's really something that I think evolves naturally when you're going back over it. You might decide that something at the start of your paragraph actually makes more sense at the end or in a separate point, or that something in the middle works better at the start. Essentially my point is that it's easier (in my opinion) to write out all of your thoughts and then polish them later, so your original opening may not be what you end up with. Weirdly, you shouldn't worry about how to start it until you've finished it.
I can try to clarify any of this if it doesn't make sense, but I think the process of writing a PS for me was pretty fluid, and unlike most other things I've ever written, so the advice is a little "out there".