Hello and welcome!
Do's and Don'ts? Let's see...
If you're going 'hard-core' and plan on doing induction,
DO keep your copy of Atkins handy. If you're kinda winging it, and don't want to do it exactly by the book, that's okay - but you might want to do some more reading, just to get a good handle on what different LC plans have in common.
DO make a list of groceries you want to buy.
DO get rid of the stuff you don't plan on eating - either toss it, or give it away. The food bank is a good option.
DO plan ahead. This way of eating involves very few convenience foods. It doesn't take a lot of time, but it does take preparing ahead of time - slicing veggies and cheese, boiling eggs... the more you do ahead of time, the more likely you are to stick with it.
When I started back in March, I hadn't read any of the books. But I started eliminating pasta, white flour, sugar, and having way more veggies, protein and water. The more reading I did, the more I was able to 'fine tune' my plan.
Best o' luck!