hi robert, im new here but im here to share with u my experience
calculated your bmi it's 41.8 and yea thats overweight.
ermm actually i work in medical dept so before i could give u some advice, here is some questions for u (i hope this not too personal?)

1. do u have any history of medical illness? heart problem? diabetes? any injury back/leg or what so ever?
if the answer is NO, then the answer to your question would be:

considering that you are a healthy guy,no cardiac problems,not so old, (lol)
the ideal way is you can either walk (better cycling/jogging) 8km a day and u say u working at pasar? if it's a few kilometres away, you should walk to work and back home everyday
but i think you should increase the length gradually day by day as far as you can go..
but.. no eating carbohydrate foods before workout/exercise.
Control what u eat.. control the calories u take. discipline is really important.strict diet!
Workout in the morning to enjoy high calories burn through that day.
Please eat breakfast/lunch/dinner at the same time everyday, make it a habit. just follow the usual time you'll be taking your meal.
maybe you can consider going to a gym 3times a week, there you can ask the trainer's advice, a professional weight loss program?
eat carbohydrate foods only after workout.
drink a lot of water!

i was overweight too.. did all stated above except i went 2 hours swimming 6 times per week and lost 30kg plus in 6 months.
Never been to a gym before, but read a lot of books. Was overweight again after giving birth, but did the same as above in 6 months i can wear my sexy shirts and jeans again    but the process..for me it's very emotional and frustating..not to mention my husband's nasty comments! lmao!