You will need to submit payment either on or before January 1, 2020.
Your first payment, also known as the "binder payment", can be paid anytime from the day you e-sign for your plan up until your start date. The good news is that once your payment is withdrawn, that means you’ve been approved! Your welcome packet and ID cards will follow in the mail about 7-10 days after this initial deduction.
For ongoing months, most companies will charge you on/around the first day of the month for that month’s coverage.