Custom Story: OnStart Scripting Help

[RurouniMori]

First off, I apologize if this isn't the right subforum to post this here, just let me know if it isn't.

I'm trying to script it so that when the games starts, the Player's screen blurs and a message comes on the screen with it. Except that, admittedly, I know very little about C++ scripting so I've been learning as I go. So, I was just wondering how i need to script it to make this 'event' happen. This is what I have:

////////////////////////////
// Run when entering map
void OnEnter()
{
OnStart(FadeRadialBlurTo(5, 5.0f);
SetMessage("Narration","startmessage",5.0f);
}
void OnStart(string &in asEntity)

If someone could please let me know how I'm supposed to properly void after and maybe some tips for coding, along with what I need to fix this, that would be wonderful. Thank you!