Usually you just send the visitors who are after a free membership to the “Registration” page and they can signup for a free membership (signing up for a free membership has no restriction). If you want to make it so they need to confirm their email address before they can create a free account (similar to what happens for the paid membership) then you can achieve that using one of the following two methods (use the one that suits your setup).
Note: you only need to use one of the following …

Implementing Google’s First Click Free (FCF) for your content allows you to include your restricted content in Google’s main search index. WP eMember has an option that allows you to enable the Google first click free feature on your membership site.
What is Google First Click Free Feature?

Read the details of First Click Free feature from Google’s site
More details from the Google Webmaster Central Blog

What You Need to be Aware of?

When you use this feature a visitor (non-member) can see your protected content if they follow a link from Google’s Search …

With General Protection feature of WP eMember you can easily secure your videos from anonymous visitors. Here is how you do it:

Create a post/page in WordPress.
Embed the video on the post/page that you want to offer to the members of a particular membership level. (If you don’t know how to configure the basic membership settings using WP eMember please watch the video tutorial here).

Go to WP eMember->Membership Level->Manage Content Protection section under WP Dashboard. In this section you can set which pages/posts you don’t want the anonymous visitors to see. …

Depending on your content you may want to have site wide content protection so only logged in memers can see any part of your site.
WP eMember allow you to enable site wide protection for your WordPress site. Simply go to the WP eMember settings menu and check the “Enable Domain Level Lockdown” checkbox.
When this option is checked it will restrict anonymous visitor access to your site (the site won’t even load unless the visitor logs in as a member). The only page the visitor will be able to access on …

The default settings is to use one membership level per user at any given time.  So every member of your site is assigned to one of the membership levels that you have created and the members can access content based on their membership level. When they make a payment for a different membership level, their current level is upgraded to the one they just paid for (Example: Upgrade from “Silver Level” -> “Gold Level”). This is the setup that will be used on most membership sites.
Depending on your situation you may need …

If you want to list all your members in a public directory style on a webpage so others can browse the list then use the “Public Profile Listing” feature.
Step1: Enable this feature by checking the “Enable Public profile Listing” field in the settings menu of WP eMember.
Step2: Create a WordPress page and use the following shortcode to display the member list:
[wp_eMember_user_list]
This will show the member directory like the following:
Clicking on an username will bring up the details of that user:
If you do not want to display the “Email Address” field …

The WP eMember (membership plugin) can be easily integrated with MailChimp (Email marketing and Email list manager). 
To integrate MailChimp with eMember simply go to the “Autoresponder Settings” tab from the Settings menu of eMember and set it up. 
This will make it so after a member registers on your site he/she will automatically be signed up to your mailchimp list.

WP eMember allows you to protect a post or page while you are editing it. When you are editing or writing a new post simply scroll down to the “eMember Protection Options” section shown in the following screenshot and apply the protection you want (it will display all the membership levels you have configured on your site so you can easily pick which levels you want to give access to):

WP eMember allows you to customize the fields that appear on the registration and edit profile page. You can choose to not display some of the fields depending on your site’s need.
In order to customize which fields appear on the form please go to the “Pages Settings” tab from the eMember settings menu. There are two sections on this page that allows you to turn on/off certain fields from the registration and edit profile page.
 Adding More Custom Registration Fields
If the default fields given by eMember is not enough then you can add …

You can use a compact login form if you want to display a one line login and join us message anywhere on your membership site. When a member logs in it displays the name of the loggd in memember and an option to logout.
For example, I have placed this compact login form on the header of my theme and it looks like the following to an anonymous visitor:
When a member logs in it looks like the following:
How to Use the Compact Login Form?
You can use the following shortcode if you are placing …