The idea of going through the guides first and then solving OG is perfect and so is the idea of alternating between verbal and Quants. It is perfectly fine if you want to understand a bit about the GMAT and then give the mock CAT. Below are some general tips:
You need to build the concepts/fundamentals before you jump in solving the problems. You can do so by choosing one of the following ways:
1. In person classes/private tutoring
2. Online classes
3. Self paced online preparatory course
4. Book heavy approach
Whatever you choose, make sure that you choose one. Because GMAT tests you on some concepts and fundamentals that you can learn from a course. Since you have already decided to go for a book heavy approach, there is not much to chose here. I would recommend you to follow a study plan so that you stay on track for the full duration of your preparation and have set targets. You can find study plans here:
gmat-study-plan-how-to-start-your-gmat-prep-80727.html?fl=menuIn addition to the preparatory material, buy the Official Guides(both the Official Guide and the Verbal Review), Question Pack 1 and the 4 official mock CATs. They should be an indispensable part of your preparation.
You need close to 3 months to prepare well for the GMAT.
1. Understand the concepts and fundamentals before jumping into problem solving
2. Solve full length CATs including AWA and IR. You can get two free GMAT Prep mock CATs and can purchase two more from mba.com
3. Make sure you solve the official questions from the Official Guide