To book the Bajaj Pulsar RS200, you need to register on the Bajaj Auto website by providing your name, mobile number, and email address, which will be verified through an OTP. Once registered, select the Pulsar RS200 and your preferred dealership, then click on "Book Now" to proceed with a fully refundable booking amount of ?2000. You can also book the bike through online platforms like BikeWale, which offers additional benefits like a free Amazon voucher. After booking, you will need to complete the purchase process by submitting KYC and RTO registration documents, and you can also opt for online insurance, finance, and other add-ons.