Is there any way my form can allow for people to "subscribe" as well as be able to purchase?

The form allows you to capture the user's information like name and email. If you want a subscribe feature where you can send email newsletters constantly, you can integrate your form with any of the 3rd party email marketing apps available in the integrations. You can find here all our integrations with the top email marketing apps https://apps.jotform.com/category/emailling

However, if you're referring to "subscription payments", here's how to create recurring payment options https://www.jotform.com/help/166-How-to-Setup-a-Recurring-Payment-Option.

For the purchase option, you can integrate your form with any of the payment gateways available in the Payments tab.