You have two options. Option 1: Fly into Anchorage and grab a rental car. Take the epic drive through Turnagain Pass and Cooper Landing down through to the Kenai Peninsula. It's about a 4 hour drive but the views are epic! Option 2: Fly right into Homer or into Kenai Airport.
You can book a room at Land's End Resort where the wedding is taking place or look at Airbnb for other options. There's cheap beach camping with great views if you're feeling adventurous.