A 70-year-old man presents with a cough productive of green sputum, pleuritic chest pain, temperature 38.2°C, respiratory rate 26/min, blood pressure 110/70 mmHg, urea 5 mmol/L, and confusion absent. His CURB-65 score is 1 (for age ≥65). What is the most appropriate setting and initial antibiotic strategy according to NICE pneumonia guidance?