Creating a Pop Up Coupon Code similar to Event Hawk

Good morning,

I am trying to figure out how to create a pop up similar to what Event Hawk does where it eventually gives them a coupon code. I have been researching but can not figure out how to do it correctly. I have EH but it just isn't worth it for the the size of my business. I only have 3 units so I feel like I can handle the texting and such without needing Event Hawk. Things that I want to do are listed below

1) I want to use my own graphic as the pop up. I see where you can create a pop-up inside WP but it forces you to choose from stuff that has already been generated. I want to use my own graphic.

2) Once they click on the image I want it to take them to a link that requires them to put in their name, phone number and email

3) once they input that info I want it to display the coupon code

4) I need to know where that information is sent so that I can have access to their contact info

I know this is exactly what EH does but I wanted to be very specific on the things I am looking for. I know I can just create a pre-generated popup on WP but that's not what I want. Also, I am not very good working with Wordpress and IO so I need some assistance.

Thank you to anyone who can assist me with this!