Here's my quickie cheat sheet on what you'll need to prep for verbal:
1. Start reading every day.
Spend ~45 minutes reading non-MCAT stuff (humanities, etc.) that's written at an MCAT level. Many folks recommend The Economist, and that's certainly a fine choice, but my preference is actually a college philosophy textbook. Pick up an old copy of Reason & Responsibility. Get an old, used edition for like $5 on Amazon. It's a classic philosophy 101 textbook used in Universities all over the country. It'll cover lots of different very abstract, very challenging ideas.
2. Get Verbal Practice Book(s).
The only materials I "officially" endorse are the AAMC Practice Tests, the AAMC Self-Assessment Packages, and the AAMC MCAT Official Guide (has a handful of practice questions not found elsewhere). After that, you could buy the verbal book from KTP, TPR, TBR, EK. They'll run you $20 - $60 a pop and the quality varies but it can be good to hear several different suggestions for how to do verbal.
3. Get online verbal practice.
Here, you can go with Gold Standards full exams (decent quality, very good price), the MCATquestion.com guys have ~30 passages in their question pool. Again, varying quality but really good price. The TBR full exams are quite good, but kinda pricey and have pretty restrictive use policies.
4. Most importantly, use your materials WELL! Folks make the mistake of just wanting to buy more, more, more. Instead, you should very thoroughly be reviewing every passage. Analyze the questions/passages/explanations AT LENGTH. My rule of thumb is that it should take you 1.5x to 2x as long to review materials as doing it in the first place. Most students will rush through only doing a fraction of that.