If I miss a Fard prayer and am obliged to combine it with the prayer that follows, which of the two prayers should I offer first, and should I pray the Sunnah of the missed prayer?

If a Muslim misses an obligatory prayer, such as Asr, and the time for the next obligatory prayer (Maghrib) has begun, he should first make up the missed prayer and then perform the current prayer, provided there is ample time. However, if the time is limited and only sufficient for the current prayer, he should perform the current prayer first and then make up the missed prayer afterward.