Just keep the heart rate at around 110-130 bpm, can liao. It's a more or less thing, no accuracy issue for your goals. Duration 30 mins minimum, start with 2 times a week, then maybe 2 weeks later 3 times, then 2 weeks later 4 times a week. If you can do 6-7 times weekly, then go for it. Then after that 40 mins, 50 mins, 60 mins.
Really need a fair bit of time needed, it's not a low hanging fruit. That is why you hear so many people going "LOL, you won't lose weight / fats with exercise".
So that's why i mentioned cycling might be better and more sustainable. The first month i tried cycling (coz of running overuse injury called ITBS), i clocked 51 hrs. Or more than one and a half hours daily.