I'm planning on creating a smaller standalone mod and is interested in if there is any way to create a specific custom character for the player at startup? At the moment, if you use COC in the menu the character you'll be playing as is the guy with the horned helmet. Is it possible to create such a specific player character with predefined armor, inventory etc? Another question regarding this is if it's possible to start the player creation window through some kind of event (Papyrus for example?).

The first part of your question I don't know sorry. Perhaps someone else knows.

However I do know how to get the character creation window up
Look http://www.creationkit.com/ShowRaceMenu_-_Game!

Thanks for the reply! I'll check that creation window out =)