[Mango]

You use your imagination to think of an appearance, personality, pick a clan/outsider rank and a legal name. As for RPing start something simple like this:
Briarfur walked into the clearing. She licked her fur and rubbed her paw across her face, scratching her ear. She settled down to eat a vole before spotting her mate, Honeybark,” Greetings, Honeybark.” She smiled awaiting his response.

(Like have them do some action and include some dialogue)

As for finding RP Partners, I VM ppl asking them to RP. Other times write at the bottom of a post “(open)” so anyone can join.