Hey, I would recommend: https://www.amazon.co.uk/Contemporary-Monologues-Good-Audition-Guides-ebook/dp/B00IWUBBWG/ref=sr_1_1?s=books&ie=UTF8&qid=1484349978&sr=1-1&keywords=contemporary+monologues
It's a good book to get the brain around new-ish monologues. I would also say get a Shakespeare monologue book as well, the wording there is just difficult and if you can master that then contemporary becomes way easier.
Hope this helps!