(Probably Stupid) Question About Ordering

When I'm messaging the sellers, do I directly link the pictures of the jersey(s) I'm ordering or hyperlink the image from their website?

Also, if I'm planning on ordering multiple do I send all the images at once, or is it more like a one at a time thing?

I checked the wiki but it didn't go super into depth on this part of it - which makes me think I'm just overthinking things