If you use CodeWarrior stationery, enabling of second core is contained in the code. It is just needed to check z0 core in the project wizard.

In the main routine second core is being started by following:
/* Start the other core by writing CRP.Z0VEC.R */
- CRP.Z0VEC.R = (unsigned long)__start_p1;
File __start_p1.c then contains necessary startup for second core and then it jumps into main_p1 routine.