Take a Look at Your Diet
Although some of the benefits of intermittent fasting are the flexibility and leniency it allows in being able to eat what you want and to eat larger meals in one sitting, you're not going to feel very well if you fill up your eating window with crap.
So before you even think about intermittent fasting, take some time to clean up your diet. Focus on eating whole foods — including healthy fats, enough protein, and complex carbs — and limiting the processed carbs and sugar. This will make your transition to IF so much easier, because if you're fueling properly during your eating window, you won't feel hungry or low-energy when you're fasting.