I started my journey almost one year ago and have since lost almost 100 lbs. Start slowly so you aren't overwhelmed. First, try to begin eating more plant based foods and begin to weed out processed foods. Lots of water. Work towards a gallon a day. And TRACK TRACK TRACK what you eat. Then begin to move by walking and stretching. Next, educate yourself. Here are some sites I found helpful.

Vegetariantimes.com
Allrecipes.com

Watch some documentaries about food and our bodies that are free on Netflix or Amazon Prime. Some of my favorites are:

Hungry for a Change
Fat Sick and Nearly Dead
Forks over Knives

The best advice I have gotten EVER is to "add the good foods in and crowd the bad out" don't go cold turkey and feel like a failure if you eat something bad. Add in the good and keep adding. Then you don't fail.

Try adding lettuce, spinach to every meal. I made chili the other day and instead of eating it in a bowl - I dumped it over a bed of greens. My daughter laughed at me making a salad outta everything. Why not right!?

Each shopping trip grab some more produce. Cuties are a super easy snack. (Clementines or tangerines)

Change it up. If you like pancakes - how about making the one banana mashed with two eggs recipe instead. Tastes awesome with a little cinnamon and topped with some yummy berries or pure maple syrup.

Dont beat yourself up if you slide back. Everyone has at least once. You'll start craving processed food as you cut it out more because of all the chemicals companies put into them to make them taste better or last longer. What really helps me when I'm craving something processed is looking at the ingredients and reminding myself that they are not healthy for me (specially the ones you cant pronounce or that are in bold black letters). If you don't know much about those then research them. For example general mills cereals have TSP which is a cleaner used by painters before they paint. Eating clean is a long road and you will learn more and more as you keep at it. The more you learn the more you'll want to eat clean!
#1: try to shop on the outer parts of the stores, example vegi's, fresh meats, dairy

Hello all I too would like to eat cleaner and healthier and this feed just helped very much.

I've found the glycemic index helpful. Pick a numer on the index (50?) and avoid anything higher on the index that that - the inevitable result is that you end up eating more whole grains, beans and veges. Good luck and enjoy the journey