KLIA’s LCC terminal has been built to accommodate all of the budget
airlines, including AirAsia. It’s a basic but easy terminal to
use.
Before the departure lounge: There are several places to buy hot
food, including a McDonalds. There are a few shops selling the
normal airport articles such as magazines, and a money changer.
Remember that you cannot change Ringgit outside of Malaysia.
Inside the departure lounge: There is a duty free shop.
Regular and Premium taxis are available outside. Premium cost just a few Ringgit more, and I think they are worth it.
All of the terminals in KLIA have free WiFi, including the LCC.