The best plan for you is a plan you can stick with...for life! See, anyone can go on any diet and lose weight...and then go immediately back to how they were eating before, thereby gaining all the weight back. If you make LIFESTYLE changes, even small ones, they stick with you for good.
So what do you need from a plan you're going to stick with for good? We're all different. I needed fairly big portions, to be pretty full all the time, and the ability to have treats every once in a while without feeling like I had "cheated". You might need other things. Once you know what you need, you can start looking for -YOUR- plan, the one you can stick to forever. Most likely you're going to have to tweak something existing anyway, simply so it works for YOU. None of us are machines - we are all different.
In terms of exercise, again, just start moving and keep moving. You can formalize more goals later...for now, just move. Start making small changes and worry less about the "big picture"...you can always adjust as you go along.
- keep posting and asking questions!