First, become a DK member if you don't already belong. Then take a look at a few of the current pages to get an idea of what to send in. All I need is:
1. A little biographical information, maybe 3 or 4 short paragraphs. Less is ok.
2. Three or more photos of your art
3. A photograph of your face, or your head and shoulders, or potentially a bigger photo with a good view of your face.
To photograph your art, here's a helpful tutorial:
https://willkempartschool.com/how-to-photograph-your-paintings-with-your-iphone/
(Long story short, put your art on the floor in front of an open door. Works great!)
We can work together on your bio (I will probably have questions regardless.) I'm looking forward to hearing from you!