hi sir..
if you want extend your wirelwssnetwork .you must do bridge configuration for each AP that connected with ethernet network.
suppose you have 5 AP ,fixed in 5 rooms ,firstly ,you must connect all the AP with main switch located in any room ,make sure all the AP configured with the same subnetmask .enter to each AP and configure it like bridge .the space of your wirless network coverage will extend .
you can ask me if you need any help.