Help a new founder 🙏🏻

I am a new founder in the D2C space. I just placed my first order from a Chinese supplier and am looking to list the product line on Amazon and my own website.

I am in the process of building my website and brand guidelines as of now and finding it difficult with a designer friend. Know any freelance designers or design agencies that can help with this? I am bootstrapping it as of now so won't be able to afford a very premium agency. Also any tips on how much should this cost etc. would be helpful.

Website will be initially built on Shopify.