Sea swimming

Hey so Etsy have asked for my tax payer information, which I get. What im unsure of is whether i need to get a German LUCID identification number?

I have created my first Etsy Listing and uploaded images into PrintShrimp. How can I tell if I have done it correctly before moving on to making more?

Hi, Only a few days in, got no traction so far (as expected) can anyone take a look at my shop to see if I’m heading in the right direction. Got about 20/30 more designs following the more recent home which I’m slowly uploading. Any tips and help would be greatly appreciated https://www.etsy.com/uk/shop/Roamura

Just getting started with my store through Tom's guides and I'm just wondering if anyone is able to help me with the custom sizing. For example, if a customer asks for a custom size that I do not have an option to purchase, how would they go about purchasing said size?