This assumes you have a website, Autoresponder, and freebie hosted so you can link to it.
What you will need:
#1 A squeeze page
#2 A OTO (one time offer) page
#3 A freebie thank/download page
#4 A "register your purchase" page for one time offer buyers
#5 A paid product thank/download page
Set up two lists in your AR. A subscribers list and a OTO buyers list. You will need to learn your ARs automation process to automatically unsub people who register their purchase and join your buyers list.
Here we go:
For settings for your subscribers (squeeze page) form select "custom thank you page" enter the URL of your OTO. I always use single opt so subscribers are instantly sent to my OTO. I also put on my squeeze page "...will be sent instantly to your inbox." This way when people land on my OTO they won't wonder where their freebie is.
If people decline your OTO they leave, and access their freebie via the link to your freebie thank/download page that you sent to their email via your first followup message. More complex funnels have more to offer.
If they buy your OTO they are redirected by your payment processor to your "register" page. Enter it's URL when you setup your buy button.
When people register they are automatically moved to your buyers list and redirected to your thank/download page. Enter it's URL for your buyers form custom thank you page.
You have now delivered on your squeeze page promise and have a happy subscriber.
Thanks for reading.