I did the Dining last year with my mom and we LOVED it! About 15-20 minutes before your reservation time, they'll escort you from the Blue Man Group area entrance towards Monster's Cafe. At Monster's Cafe they will scan your Dining and Event Passes and you'll enter the restaurant. There are a variety of food options, drinks, and desserts; you can go through the line as many times as you'd like. Once seated, the scare actors will begin to rotate throughout the restaurant, stopping at all table to ensure that everyone gets an opportunity to see and interact with all characters. Once you're done, you'll be able to head into the event! Hope you enjoy!
Also, I found youtube to be a good resource when I was doing my research last year. Quite a few videos on the Scareactor dining on there