When we work with organizations and groups that are starting out with their process, we prefer you to begin assembling the "building blocks" of your website. Here are some pieces to help you think about how you will build out your product.
1) Domain name login and details: a domain name is the URL for the site, e.g. "http://www.yourproduct.io" and can be purchased easily at a name registrar such as GoDaddy.com.
2) Hosting login and details (FTP and Control Panel/SSH): depending on what needs you have, we recommend either Pantheon or Acquia hosting for Drupal sites that require heavy user interactions, or Nexcess.net for products that are more informational.
3) Primary contact: Who is the main decision-maker with signoff approval on this project?
4) List of desired "roles": Depending on your requirements, different people will have different levels of access to your content. What are your different types of "roles" that a user might inhabit? For example, there may be an "Editor" role, and also a "Member Services Manager" role, as well as some default roles like "Paid Member" and "Administrator".
5) Initial list of users, including: username, e-mail, and role (in spreadsheet or table): Who do you want to allow access to the site as it's in-development? These are your core teammates or users that will help guide the direction of the product as well as give feedback and submit initial content.
6) Initial design specified such as logo, motto/byline: Certain elements of your design will be thought-through and prepared, as much as possible. Any initial elements such as a logo, overview, mission/vision/values statement, and product description, as well as team bios, are important to begin assembling.
8) Consider what type of user information you require and list out the different fields, e.g. "First Name" and "Last Name" as well as the required fields vs. the optional fields. For example, if you require user login you'll need to collect a username, password, and e-mail -- note that this may be offered by third-party tools such as Facebook or Twitter.
9) All images, logos, digital downloads, or stock photography ready: when you have collected your logo as well as stock photography, keep it together in a folder organized by topic or content page.