Checklist
As a technopolitical project, Decidim needs several things to work. This is a non comprehensive list that serves as a general recommendation of what things you need to have it working with the best practices:
Technological
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Choose a domain or subdomain for your application. Some typical names involve "Participation" or "Decision" conjugations. 
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Choose which languages do you want for your application. In case that your language isn’t supported you should translate it on Crowdin. 
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Customize the look and feel (colors, pictures, fonts, etc). 
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Configure SSL. We recommend using at least Let’s Encrypt for a minimum security. You should also check that there’s an enforced redirection from HTTP to HTTPS on your web server. 
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Configure your SMTP server. 
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Setup the geolocation service. We recommend using Here Maps, but you can use other kind of tiling server compatible with Open Street Maps. 
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Setup backup on your server. The most important things to save are the public/uploadsand the database.
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Decide and implement which kind of Authorization you’re going to use. 
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Comply with our License (Affero GPL 3) and publish your code to GitHub or wherever you want. 
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Review your decidim initializer on your application (config/initializers/decidim.rb). 
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Configure your ActiveJob background queue. 
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If you want, configure your social providers to enable login using external applications. 
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Check that you don’t have any default users, emails and passwords, neither on the admin or on the system panel. 
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Configure scheduled tasks. 
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You should have a staging / preproduction environment where to test changes before deploying to production. If this environment has a copy of production database, you should disable the SMTP server and for privacy issues you should change the usernames / names / emails. 
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You should have a exception tracking service or gem, like Errbit, Exception Notification, Airbrake or Sentry. 
Contents
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Ideally you’ll have a Team formed with experts on IT, Communication, Participation, Design and Law. 
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Texts for at least, terms of use, privacy policy and frequently asked questions. To show the "Terms and conditions" body text in the "Sign Up Form", it is a requirement that the slug of this page to be equal terms-and-conditions.
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Comply with your current legal requirements, like to registrate your privacy policy with the autorities (eg LOPD on Spain). 
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Fill the Participatory Processes Configuration Form to prepare your Participatory Process for Decidim. 
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Read the Administration manual. 
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Participate on MetaDecidim. 
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Read the Decidim Social Contract.