Install & customize Joomla template: 3 languages website

Would like to build a 3 languages (English, German and Spanish) Joomla website: - Joomla template and content is provided by me Initial tasks: - Advise on Joomla template selection - Install the Joomla template on the web hosting server (probably 3 websites: 1 for each language) - Create language selection solution/menu - Customize the template - Some Graphic Design involved - Provide support on articles creation/administration, etc - Website should work in iPad, mobiles, etc - Other tasks that might arise