Trying to get myself in check

My hope is that I can walk longer than 15 minutes per day.  I really need to, but will it do any good with what I have been eating lately.  I really that I also need to make a brand new eating plan.  I might as well call it a diet plan since I have not been eating healthy.  My food cravings are in need of help.  I was doing well but I have all but given up.  That is NOT what I want to do.  Gaining weight has been quite demoralizing.