Broncoslover

Calling for help!! I'm looking for a set of wheels and tires for my black 2012 Ford F-150. I'm interested in a set of XD-Series 779 Badlands Chrome Wheel (18x9"/5x5.5") but I don't know what offset or pattern I need. It currently has 18" wheels on it but not sure I need to stay with that or not. I'm looking to put some grapplers on the wheels but not fixed on brand. Just want aggressive and wide look. Any help?