Like I said, most ESP (email service providers) have the capability of creating automated email workflows. So, instead of getting an email subscriber and initially sending them one or two emails, before getting distracted and forgetting all about them, you can be sure that you have emails sent to them over the course of a few days, weeks, months etc. with email automation.
So you should review the product to see if it provides value for your subscribers. Does it work? Is it helpful? How is the support from the product creator? You are co-signing on all of this when you send that email to your list. As a newbie you still need to nurture and protect your list by emailing them frequently with more informative content. Just make sure this product meets your standards.
Before you can send AWesome emails with AWeber, you'll need someone to send it to. The easiest way to begin building your list is to import contacts that have opted-in to your email list, or gave you permission to send them emails. These could be subscribers you've emailed from another provider, or a list of contacts that you've built through your business.