There are seven distinct phases to the Perfect Customer Lifecycle:

Attract Traffic
This includes all of the work you do to generate interest in your business, like website traffic, foot traffic, etc. that comes from online/offline advertising, partners, etc.
Capture Leads
Smart businesses are very intentional about capturing contact information for interested leads as well as permission to follow up. As a real estate agent you run a small business. You can’t follow up if they leave your site or store, open house or showing appointment without giving you their info! What thing of value can you offer in exchange for their contact information.