Wolf, Lethean and Train, brilliant to have you all on board!
In terms of format, Spotify is just a preference but I can be flexible, particularly during lockdown as most listening is at my home computer. I've already had a submission by Youtube playlist which is fine, you can tell me the artist and songs and I can see if I can get them on Spotify myself, or you can upload the digital files and send me the link.
And in terms of timing, you've got all week for this first round so take your time if you need to!