Clear out your cabinet and fridge that has anything more than 10g of carbs per serving. Find out your diet goals here http://keto-calculator.ankerl.com/
Then go shopping with this food pyramid in mind, you diet should be 65-80% fat, 15-30% protein, and 5% carbs, WITH A MAXIMUM OF 25-30 CARBS PER DAY!!
Then exercise at least 2 times per week, and buy a scale.
Next be careful eating out, hidden carbs are in lots of foods.
Increase your water intake, fat is harder to digest.
Long term have cholesterol blood pressure and liver enzymes tested from doctor 1-2 times per year. Eating high fat is more difficult on your liver, but much friendlier to your whole body.
Good luck and keep it keto!