Getting Permanent Residency Status First Step

Yesterday we went to our local Mexican Consulate and started the process of acquiring our permanent residency status. It was easy, thanks to Oswaldo at our local Consulate. He answered all of our questions via e-mail, and even had us send him copies of documents for him to check before we made our appointments and went in. Thanks to him, it only took 2 hours and we had everything we needed the first try. Realize that the dollar amounts vary with the exchange rate, so the numbers are approximate, but very close. Here is what is required:

Passport, a copy of the page that has your personal information on it, and one passport photo.
A letter of intent, written to the Consul. This is a paragraph about why, where and what you plan to do in Mexico.
Application form
$32 US
Proof of finances.
For one person, you must show a minimum monthly income of $1,900. To add a dependent, it is $500 more. OR you can show a net worth, per person, of $175,000. It is either or.
Acceptable documentation wasn't too tough. 6 months of bank statements showing the deposits, or 6 months of statements from a brokerage account, etc, showing the net worth. If any accounts are joint, a statement that both parties have access to the funds independently. If you show a monthly income, the source must be shown. If you file as a person with a dependent, a marriage certificate must be provided.
Each of the above have to be "official." Banks will usually notarize or certify the statements and send them to you electronically, at no cost. What we finally did was talk to a friend who was a notary. We signed every single page, all 14 of them, and she attached a notarized statement that said that she witnessed us signing them. Surprisingly, this was accepted without question.
We were interviewed by the Consul, and asked about our plans, and our jobs before retirement. We had our photos taken and fingerprints.

Two hours later, we left with a visa in our passports that is good for a single entry, and is good for 6 months. When we arrive in Zihuatanejo, we go to the ????? meet with them, and are to receive a card that we think we have to renew every year, and on the fourth year, receive a permanent visa that we do not have to renew.

The entire process was much easier than we expected. Our question now, to those in the know is about what we do when we arrive in Zihuatanejo.

Where do we go? What do we need to have, anything? What is the cost? What do we have to renew annually?