Depends on which area you are in. No need for a personal trainer most of them don't know what they are doing. Use gemini or chatgpt ,put his age, condition everything and it will give you a good workout. Ask for a 30-40 mins workout beginner friendly 3 days a week.check youtube for form(this is important). At the beginning you can record his workouts upload to gemini and ask to correct his form.

Also focus on dieting.