<human>: I'm 18 years old, 6'2" about 250 lbs. 
   
   About a year ago I weighted the same, and I won't even lie I went to a juvenile corrections facility for a little over a year and during the time I was there I went from 250 to about 170 so I had lost about 80 pounds all together, the crazy thing is I did barely any physical activity at all maybe 3 hours worth of walking a week with a game of basketball thrown in once in awhile.
     I've been out since August (about 8 months total) and I've already regressed to my previous weight of 250 lbs.
     
     I want to know if just simply eating healthy  (lean meats, kale, and cut out all the junk food/soda/beer) on top of daily walking or other various exercises will be enough to get me back in shape again, because if a year of sitting on my ass eating small portions yielded pretty good results I'm hoping this will do the same.

     I have no idea if this will actually work I just need advice from a real person other than various health sites contradicting eachother.

     Will walking and eating healthy be enough? Should I try supplements? Ketones? Where do I begin? 

     I'm not looking to get ripped or anything I'll just be happy to not have tits and lose some fat, I have 2 kids and 2 jobs so I don't have much time for a gym but I'm thinking about saving up for a set of weights or doing insanity.

Can you give me a shortened version of the text?
<bot>: I'm 18 6'2" 250 lbs male, my goal weight is 180 or lower, what all do I need to know or should I do to start this journey?