Now you can see that the home page is plain, but however, our previous page have other area that show other things, how can i make it to like my previous settings?
I think you need to add 3 portlets on your home page.
Probably a "Static text portlet" for "Meeting Room Booking" and "Useful links" and a "Collection portlets" for "Annoucements"
Take a look at the documentation here :