Data entry in Method is identical across all our collection points (Outlook, Gmail, web forms and our Method CRM screens). The Entity and Contacts table will have a record of every new lead, customer or vendor. The Customer table will have an entry for both leads and non leads.
walterh: What is the best way to enter and process leads?
There is no best way, we provide multiple options to enter your data from sources like Outlook, Gmail, web forms or the Method CRM pages (new lead and new customer). You can also import your data using our Import/Export tool found under Customize > Integration Tools.
walterh: In which table should I create the dropdown menu?
It sounds like you want to keep this data tied to the lead record so I would add a drop down field inside the Contacts table. When you're editing the Tables / Fields for Contacts, select the Field Type of drop down and click Add Field. On the next popup you'll be asked to create a new table and then you can populate with your choices. Please let me know if you have any other questions.
~C