While I agree with you about abortion and think you should write your own essay, I know how you feel when you have no idea how to start an essay. Here's a hook: "America has been split about abortion for years now. It might be hard for you to choose pro-life or pro-choice, so I'm here to persuade you to choose pro-life." Use something like that.
How to start a persuasive essay
Outline your essay.
Come up with your hook.
Write an introduction.
Structure your body paragraphs.
Use the last sentence of each body paragraph to transition to the next paragraph.
Add a rebuttal or counterargument.
Write your conclusion at the very end of your essay.