If you do nothing you are presumed to be one of those who will pay the entire sum of annual dues in Jan. To set up monthly withdrawal after a resale, you need to contact member accounting to do it and fill out a form and provide an account number for automatic withdrawal. You must have a US bank account because they won't do it for accounts in other countries. If you closed on resale in August, you cannnot start automatic monthly withdrawal until the 2011 calendar year as all dues for 2010 would have been accounted for as part of the resale closing, but should contact member accounting now to get the form done and set you up for next year.
Many prefer just paying annually. I like the monthly withdrawal from my account including because they aren't charging any interest or fees to do it, i.e., I pay the same in installments over 12 months as someone who pays the entire year of dues in Jan.