Fresh chicken wings: I usually buy them in trays labeled as "party wings," already split into flats and drumettes, with the tips removed.
Butter: I use salted butter in this recipe. Unsalted butter should be fine too. And you can also simply spray the chicken with some oil rather than coat them in butter.
Kosher salt and black pepper: I use kosher salt in most of my recipes. If using fine salt, you might want to use less of it or the dish could turn out too salty.
Spices: I like to use garlic powder and paprika. You can use smoked paprika if you'd like. And onion powder is also very good, in addition to or instead of the garlic powder.