First of all you need to sign up for a free account at MailChimp. Here is the signup link (Aff. link). Once you have signed up, and logged into MailChimp dashboard, you will be seeing a screen similar to this, and click on create a list. The good thing about MailChimp dashboard is, it’s interactive, so you will not find any issues with getting started with it.
Pop up form – Perhaps the most “in-your-face” option, these types of forms have a high likelihood of conversion. A pop up form appears over your web page and gives more attention to convey the value of your list. Many sign up form creation tools will allow you to customize the length of time at which a pop up form appears on your site (we recommend ~45 seconds, but testing is key).
The main weakness I see is the price-point where small companies are concerned. If you don’t need all of AWeber’s bells and whistles, there’s no reason to pay for them. You’ll also want to make certain that if you are trying to cancel your account, you’re not just accidentally suspending it. This is especially important where the free trial is concerned, as AWeber requires your credit card info.
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.