Website template urgent need

• Website URL:
  I have not picked a name yet
  
  
• Website description:
  I will be selling clothing from kids to adults to dogs, I will also sell house hold items like bedding, curtains, towels and more
  
  
• The Structure of my website:
  I will like a runway look with a man, a woman, kids and dressed dogs, these can be done in slides I will also like each page to have its own theme and the ability to add more pages.
  
  
• My favorite template designs on Free Website Templates:
  Ww.big commerce.com/runway, it has some of the features I am looking for, it's classy and looks very professional.it does not look cluttered
  
  
• Other websites whose design I like:
  Www.zappos.com
  Www.wayfair.com
  
  
• Preferred colors:
  Orange and green
  
  
• Notes: does anybody know if I can customize existing themes and add pages to existing pages on website builders such as shopify and big commerce?