Jap, if you can, just start walking every day.
If (after an hour or two after your walk) your legs don't hurt, try it with a longer walk the next day. Whenever your find your temporary limit: Don't surpass it every day. Start slow and see if you can surpass your "last temporary limit" a week later.
In my personal opinion: If you don't like walking: Try to like it (try it for a week). Otherwise try to find something that you like. For me it was bicycling (also to technical stuff like tuning your bike). If you have the impression that you are to overweight for most sports: I think you will have to like swimming ... ;-)
Some people also like this "Gamification" Stuff (Smartwatches etc.) ... depends on if you need to motivate you every day.
For me i found a simple rule: Just do it (not a sponsored catchphrase). Just get up and do your little 10, 20, ... 60 min workout. Don't think about it. Think about something else that you are keen on. Think about your work (most ideas i had for software problems came while i was on my bike).I think ist also OK to get a nice sweet after your workout (of course: be fair to yourself!).
So whatever you are going to do: Do it, don't think about it every day, let it be a habit, but find something that you like somehow. People that are walking are mostly liking the nature and the quietness.
By the way: don't stress yourself with "getting fit fast". If your getting fit fast, probably your bones will suffer.
AAAANNNNDDDD now the benefits:
1: If something got a habit, its not so easy to get rid of it!
2: If you are sporting outside (fresh and clean air) you will probably soon notice that your are not getting thick so much.
3: Mostly (if you are not exhausted every time) you will experience a "sharper" mind. First, just some seconds and later on for longer (like an hour or two). I was amazed when i actively noticed this. Its like the programmers flow... but without actually programming.
4: You know the other stuff: self-esteem, mental vitality
Ah, by the way: Try to eat something healthy. I think its always hard to completely change your eating habits, but change it step by step. For example: Eating a banana and an apple after your workout. Nothing more. You will also soon experience a difference if you "accidentally" missed your banana and apple ...
Greets,
Chris