I have been making my own missions (using DYOM) for a while now, and I have taken a massive learning curve since I first started, now my missions are better then what they used to be.. but they are not perfect, I am still learning and trying different mission techniques
Known Bug:
For some reason, the HUD does not appear at the start, so I will explain where you have to go until I can fix this.
1. Head to the building where "Just Business" takes place
2. Head to the Los Santos Racing Stadium
Mission Details
In this mission (mainly a test) you play as Cesar,
The mission begins with a cutscene of Cesar watching T.V where he finds out that local racing hero, Jimmy Gibbs Jr. (Cheesy to use, I know ) has been involved in a massive car crash and may never race again.
That is where you step in and head to the SARC HQ to sign up. More happens but I won't write the whole mission out.
Extra Note
This mission is a test. I'm trying out using actors and cutscenes alot more and if people like this mission then I will continue to make more. Feedback Welcome.