I glad you have made a decision, that is the hard part.
My weight loss of 45 lbs took about 3 or 3.5 months. There are many, many ways to get to where you want to be, any of the suggestions above may work for you, but you may end up trying them all over the next year only to not get the results you want.
I too, did a lot of different programs with some small progress. Finally decided that I would seek professional help and went to see Dr.Garcia, results started the first week and continued every week until I got to where I wanted to be.
My wife was taking three kinds of Diabetic meds and was a week away from starting injections. Two weeks into this program and she was able to drop all the meds except the lowest/weakest one.
My suggestion would be to make an appointment at his nearest office and get going.
Being healthy and in a condition to ride with just about anyone you want to ride with regardless of their speed is the result. ( of the weightloss and a lot of ride time)
( Until you break you femur and get sidelined for most of this year like I did recently)
I know many people that have followed his program, it worked 100% for them.
PS. I don't believe there is anything simpler or easy to follow, no cauculations, no keeping track of anything, just follow easy food choices.
Go here and good luck!http://www.garciaweightloss.com/