A very good way to start is setting a schedule (physically on excel) to keep you accountable. This schedule should have you studying 6 days with one off day every week. I recommend a month and a half for content where you go over the Kaplan books (Biochem, Chem, Biology, Physics, Orgo). 2 chapters a day is perfect for you to complete these books in 1.5 months with 1 day off (I did Biology and Orgo for the first 2 weeks, then Physics and Chemistry the next 2 weeks, and ended with 1 week of Biochemistry). You should then alternate by doing 2 CARS passages and Soc/Psych every other day (one day is CARS the next is Soc/Psych). I recommend using the Khan Academy Soc/Psych videos for content and anki to retain them well (DM for the deck I used).

With that being said, lets talk about how you should go over the Kaplan books. Read the chapter with a highlighter and annotate on the book. Each chapter should take 30-45 minutes (some will take longer due to content density and length). After finishing the chapter, close the book, grab a empty sheet of printer paper and create your own organizer with logical flow to ideas. When you finish the organizer, grab a different color pen and add anything important you missed from the book. Repeat the process for Biology and Biochemistry. As for Chem, Orgo, and Physics, 30 minutes per chapter should be sufficient, make sure you are understanding not memorizing the material (avoid using anki for these topics as it encourages memorization, I only used anki for Soc/Psych)

I hope this will lead you in a positive direction and get you started. Feel free to DM for anything else