Model Selction In SI Hydrogen Engine
 

I have finished modeling my IC engine cylinder .(Check It Here).
Now I have to do the Spark ignition.I had planned it in 2 steps.
1. Just ignite a mixture of h2 and air in cylinder using a spark
2. Inject h2 to cylinder via a mass flow inlet and ignite it.

I have selected the following:
Solver-> unsteady, 2d
Energy Equation
Viscous - k e model
Boundary conditions
Defined dynamic meshing and completed mesh motion

For Spark ignition what combustion models should i choose.(For 1st part. Combustion of contained mass)
I am confused with the combustion models and defining the spark and defining the reaction)
Should I use Species ->transport and reaction or premixed combustion?
How do i properly define the mixture inside he cylinder?