Hair highlights advice help me?

how would i do two highlight colors should i get a foil done or lowlights and highlights. i have dark brown hair its almost black when its wet and i wanted to do mocha or caramel or honey brown or blonde or mocha i want it more warmer but i want the highlight to be wearable in my hair so how would i put the two colors in my hair as highlights i have an hair appt the end of this month and i do not know how to ask her i want two highlight colors in my hair