By nestle chocolate chips, and follow the recipe on the back, as PP notes, that is simple enough to start. Baking is a science, so the one thing you really need to do is have real measuring cups and spoons, and make sure to take the flat end of a knife and level off everything so you have *exactly* 1/2 cup of flour or *exactly* 1 teaspoon of baking soda.

Kingarthurflour.com
Lots of amazing recipes, step by step instructions (with pics!) and helpful replies if you comment on any problems you encounter. Love them. Will go there some day.

Do you have a friend who bakes? There's no substitute for in-person demonstration and sharing the million little tips. Other than that, get a good book--PP's recommendation sounds good.

Don't be intimidated. Try to start with easy to medium recipes and read them at least twice before beginning. It's all about trial and error.

I like the PPs suggestions of starting with cookies and moving on from there, and definitely always read a recipe all the way through first.

If you're interested in making cakes, All Cakes Considered is a fun book--my brother got it for me for my birthday a couple of years ago. The author is an NPR staffer who bakes for her coworkers and she starts with simple recipes and they get more complicated as the book progresses.

If the Cook's Illustrated folks have a baking book they are almost too detailed in their recipe instructions.

I think you should get a good comprehensive home baking book by a reputable author. There are several out there. I recommend "Baking from my home to yours" by Dorie Greenspan, which has a ton of recipes for not just baked goods but other crowd-pleasing favorites like from-scratch pudding.
In general, I think newbie bakers tend not to realize the importance of reading a recipe through BEFORE you begin, so definitely do that!

YouTube videos, King Arthur Flour tutorials

I would start with cookie doughs ( simple ones like peanut butter or chocolate chip) that you can scoop or use as drop cookies. The roll out dough might frustrate you for now so skip this.
Then I would graduate to quick breads for muffins and if you do well at this you can try loaves of quick bread. I find the muffins easier because they bake for a shorter time and you can use muffin tins with the liners so you dont need to remove anything from a pan like you will a loaf.

After that, I would try a bar cookie or fruit crisp/crumble. You cant go too wrong but you might need to sift or measure or form a crust of some sort so there are a few steps.

from there you can venture if you want into cakes, pies, and rolling out simple doughs.

I would hit yeast breads or baking with yeast last as it is trickier and more time consuming in a lot of ways.

I consider myself a decent cook but do not know anything (I mean anything) about baking. I have never even baked cookies with store bought mix. Given that, where do I start? Thank you!