Cheeses: place 2-3 different cheeses, or more if you like.
Buy a mix of hard and soft, as well as mild and strong cheeses.

In picture: garlic-chives cream cheese and
Japanese smoked cheese. I forgot to add my aged Edam cheese 🤦🏻‍♀️

Deli & cold cuts: choose a mix of spicy and non-spicy cold cuts. Examples: salami, jamon, prosciutto, pastrami, chorizo, sliced cooked sausages are also a good addition, cured beef sticks, pepperoni, ham, etc.

In picture: Jamon Serano, Chorizo Pamplona, Salchichon, Little Smokies, and glazed ham. I also had some Chorizo Iberico but I saved it for NY.

Sweets and Fruits:
Add non-messy and dry (not wet) fruits, like grapes, cherries, etc. Raisins, prunes, olives, sweet dried fruits are also a great addition. Chocolate squares, are a yes!

In picture: dried mango balls, dried tamarind-mango balls and Pastillas.
I also added a couple slices of Bavarian cake, not a common addition.

Crackers and Bread: To thoroughly enjoy the cheeses and cold cuts, there must be something in the board that you can spread or top it on.

You can buy water or salt crackers. Or you can toast (and herb) a good type of hard-crusted loaf bread, like a sourdough or an artisan multigrain.

In picture: sliced, herbed-buttered and toasted sourdough bread.

Arrangement:
It doesn't have to be organized. Most boards I've seen are fully-packed and quite messy.
I just arranged mine as so because I like lines and patterns 😬