As a complete newbie to Affinity Photo (and with no PS experience) I would like to know if anyone can point me to a decent vimeo/youtube/whatever video tutorial on how to prepare a photo with CMYK output for silkscreening (with frequency&angles for each channel, +anything on adding single spot colors to a screenprint. There are a few on youtube for Photoshop but I have not been able to find anything comparable for Affinity Photo. Thanks for any help.