Salt and pepper are your basic ingredients everytime you decide to barbecue. My preference on pepper is i mixture of black and pink because they are mild and not as spicy as red pepper. I usually use a lot of pepper because I love it (I even use it in cocktail drinks and ice-cream with mastic).
There are many variations of salt flavors you can buy almost anywhere. If you haven’t tried it yet i strongly recommend getting a smoked salt package. It accompanies almost any type of meat you decide to grill.