Pictures are worth a 1000 words, so images or graphics reflecting people benefiting from what you offering will help with the emotional connection. Be sure your logo is present and the branding consistent. 

Getting someone's email is critical no matter what the result you want or get. Offer them a freebie (how-to, tips, info sheet), a discount or a bonus if they provide their email address.

• Auto responders will provide the freebie
• Also, notify them that they will be receiving future updates, offers & tips from you and that they can unsubscribe at any time.
• CRM interface wll provide tag the prospect for followup

At a minimum:

• Provide testimonials
• You might also include FAQ's (Frequently Asked Questions) such as delivery, return policies, etc.
• Make the call to action easy

The more expensive the product or service, the more likely you will need to provide more information:

• A video (1-3 minutes) to explain the product or service, introduce yourself, etc.
• Statistics, stories or details can be shared in a feed or as part of the request for their email.
• Success stories or cautionary tales are also good.

If you want a phone call, consider a scheduler (feature of some CRM's) or an 3rd party widget. It looks more professional, impacts value on YOUR time and makes it easy for the prospect.

I recommend, NOT offering this for products or services below a price point you determine. Do you want to spend X number of hours to possibly sell products under a given price point? Use a video and/or FAQ's to address. 

Also you can have a form or chat-bot address a question using the price-point question to help you determine how much time & energy to invest.

You might ask them if they know someone else who might be interested. Creating a simple referral form will make it easy for them. You can offer them a bonus if someone they refer buys your product or service.