There's a few important things: Your age, height + weight (cms + kgs), your parent's ethnicities and 'build' - by which I mean your bone structure, do you have a small, normal or large frame? And finally what do you tend to lean towards in terms of efficiency, sprinting or long distance running? All you're going to receive is broscience. If you wanted to get ripped you'd be better off doing your own research, and making informed decisions about which parts of the interwebs are total bullshit (90%) and which ones are legit science. I'd first say you need to decide whether you want to shed some weight or head straight to building muscle mass. There's not much point in heavily training whilst aiming to lose weight, though a starting strength program would be good so you have a foundation to work off once you switch to building. I'd say start with a calorie restriction on your basal metabolic rate.. Avoid commercial diets like the plague, just increase your protein intake slightly at the expense of carbs which will help increase satiety. Starting strength programs vary, and there's no specific routine that's 'the best'. Google is your friend when it comes to this and try a few out until you find one you like. After that, as Terminator was mentioning you need to think how you want to look. Muscle anatomy is god damn fascinating stuff and there are so many components that go into shaping a 'muscular and defined' body. So yeah, diet in check, starting strength, you'll have a little bit more muscle and definition from that alone, and if you wanted to get into specific training programs you're at a good point. If you ever feel like you're about to purchase a nutritional supplement send me a PM and I'll tell you whether or not you're wasting your money. I have a friend that used to buy the most stupid products for the most stupid prices, then nonchalantly switched to an oral anabolic steroid with not so much as an afterthought. He was going to move to IV steroids before our entire friendship group bullied him out of it. I'm guessing you're young, and you could seriously mess up your body. So feel free to ask. All this being said, I'm a fatty. I just know an ironic amount about nutrition and biology.