A 50-year-old male presents with sudden hematemesis 4 times (approximately 1200ml) and melena twice (approximately 600g), accompanied by dizziness and palpitations. On examination: blood pressure 75/45 mmHg, heart rate 118 bpm, mild icterus of the sclera, abdominal distension, liver not palpable, spleen palpable 3 cm below the costal margin, shifting dullness (+). What is the first-line management for this patient?