Shopify update

I want to retain the current theme on mrbreckz.com but have the layout and offerings similar to this site https://label-source.co.uk i want a specialist who know s what they are doing and not someone that does it as a hobby I sell mostly one off products and i need to ensure my products are onpoint i am not looking for someone to install a load of apps I also want a partner that i can reach out for changes and has the ability to create banners and newsletters etc