Hey there, a6, you know a rub for those ribs can be from simple to complex...and all good. A bit of kosher salt, pepper can be fine. The more classic is a lot of paprika, some brown sugar, a touch of cayenne, salt, pepper, cumin, garlic. The sugar is an important part of this one. Makes a bit of a glaze.
Put that rib in the middle of the grill. Light the outside burners, to medium heat, and leave the middle burners off. (Throw in wood chips if you can.) Let her go for about an hour. With the gas, the job goes fast.
Then, as they say, you can choose to mop or not to mop. Let them cook as is, and its good, dry. Brush them with an apple juice sauce, and its good. Finish them with a red BBQ sauce (last 15 min) and you get another goopy effect.
There are recipes for rubs buried in the archives of this forum, and elsewhere in cyberspace. Dozens of them. Hundreds.