if u want to get into philosophy i highly recommend Russell's History of Western Philosophy. it's 850 pages, but i think its the best work at really explaining philosophy's history and it brings u up to speed so you can go from it to pretty much anything you want (schopie, ludie, nietzsche, kierkegaard, foucalt, or older too). i read it to start this summer and thought it was amazing, what he does really well is place thinkers in a context to previous and future thinkers and also historical events and their personal context. its never boring, because to be honest its basically 10 or so pages per thinker (sometimes less) and these were the people that were on the cutting edge of thought for their times.
if u want something shorter i think that Hume's Enquiry is probably the most significant philosophical work ever made and its short and written for a layperson