Hey, I've got a degree in philosophy, if you need any help at all just message me!
In terms of essay structure though, when I was doing a-levels we were told to write a short, but clear introduction that included the wording of the question like "In this essay I will argue that..." and then write 4 paragraphs with arguments for your point. Don't argue for the "other side" unless your aim is to tear it to shreds in the next sentence. This isn't GCSE anymore, you don't have to prove that you know what everyone thinks, you're writing an argumentative essay. Your conclusion should then again summarise the argument that you've made and why it's convincing.
If you can remember quotes from specific philosophers that back up your point its always helpful, but if not you can always paraphrase them. It doesn't matter too much if you can't remember the book or essay that the quote is from because 1. you're not expected to have read the books at this point and 2. you're expected to write the essay in about 40 mins, you literally haven't got time for it.
But like I said if there's anything else I can help with just let me know!