T-Shirt Designer for Merch by Amazon

I am looking for a designer for MBA. The designs should have a resolution of 4500x5400 and 300 dpi. Templates are available. To rate the quality of the work, I will send you a Upgrade to see actual infond me a rough sketch of your design and we may become Upgrade to see actual info the future I will send 20 templates and you design. Please tell me what the price for 20 designs is.
I also need an invoice for the created designs. A confirmation that identifies me as a rights holder is also needed
I’m happy to work with a great designer. If you contact me the first time,please write the first word "Blaubeere". Thanks.