Diet is the key for any fitness regime. I am not a huge supporter of supplements and believe you can achieve your desire fitness by changing your diet. If you are trying to loose weight, I will recommend taking a look at Ultimate Diet 2.0. Its very well written with focus on reducing fat if you have 15 % Body fat composition. But if you are on higher side of Body fat then you can pretty much reduce it by Cardio and new diet regime. There is plenty of information available online. I use to follow a guy name scooby on youtube and found his tips very helpful. He started his own website
http://www.sweat4health.com
Where you can keep progress diaries for free and have access to plenty of information for free.