You don't need help, you just need to make up your mind about where you want to go and how long you want to stay in each place. This is strictly a matter of personal preferences, time constraints, and budgetary considerations.

Until you make up your mind on the above, nothing can be effectively planned WRT the RTW itinerary.

One you decide on the above, the rest is fairly straight forward. I just finished making a paid RTW reservation for March. 17 legs in 20 days that took me 2 hours to make reservations for once I had the where and when figured out.