Design work for email newsletter plus more

Hi, I am looking to create a long term relationship with a designer to work with for all our newsletters. Initially I need the following:

Header banner for the email newsletter +
facebook and twitter cover photo
Buy now buttons
Banner to join our whatsapp group (see website www.youwouldratherbuy.com)
Banner with our social media accounts to follow.

Please have a look at the website www.youwouldratherbuy.com. Please send examples of design work you have done for facebook or twitter cover photos when applying for this job.