Professional Beats Website

so the website that I’m trying to have needs to have a domain which I don’t have yet should I buy it first or is that included?
Also, I need the Website bilingual English and German, If you give me the instructions I can do the German part
Also, Im linking my website to “Wetransfer” so that they can pay on that website first and then be directed to mine or basically vice versa
-a pop up of a reference
Like one before track and after track just like little snippets
-Mobile friendly
-BeatStars Design
-Creditcard and PayPal friendly

Thank you!
Safija