"Thank you" -page after submitting Contact Us -form - How to create?

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Hi Friends,
I have an issue regarding ”thank you” -page. How you have managed to put Facebook Pixel and Google Analytics & Ads -code to thank you page. I have a Contact Us -page and I want to track my contacts with Pixel & Analytics.
I think it would be better that after clicking ”send message” it redirects to separate thank you page where I can add the codes. 
  • How have you done this - is there free Apps to create that one page?
  • Or have you created a one page and modified the code that it send to client to ”Thank you” -page after they submit the message?
  • I don’t have products in my "store" - I only use Shopify for ”website"