Dan,

The following point are the most essential according to my point of view.

Decide whether or not your website will offer free or paid memberships.

Purchase a domain name and choose a web hosting provider for your members only website. When choosing a web host, choose one that has a content management database, such as Joomla. The content management database will allow your website visitors to sign up for member accounts.

Establish a merchant account or payment gateway if your site will be for paying members. You can establish a merchant account through online websites such as PayPal.com, FreeAuthNet.com and MerchantExpress.com.

Log into the control panel of your web hosting account.

Begin creating pages for your website inside your file directory. The homepage should include information that encourages membership. The page should list your products and services. The page should explain the benefits of membership. Include a payment button on your pages if the site is for paid membership. To place the payment button on the site, simply copy and paste the HTML code that has been provided by the merchant account provider.

Place a "New Member" signup box in plain view of your website visitors that will allow them to set up a new member account.

Place contact information on your website so that your members can communicate their concerns to you with ease. This can be a telephone number, email address or online form.

Develop a list of "Members FAQ," members' frequently asked questions, that address the common questions your members are asking. By providing a Members FAQ, your members will be able to find answers to their questions without having to contact you.

You can read the whole article here!