Wow! Ikea is pretty cool. Now if you have never been to Ikea here are some pointers that help keep me sane in this place.
First timers, devote a few hours. It will take you at least 2 hours minimum your first time. There is just too much to look at and too many ideas. It can seem confusing at first but you will catch on.
Second, I recommend going during a weekday morning if possible. It's pretty crowded on weekends and with all the people, maneuvering through, and everything you want to take in, you will be able to appreciate it more.
Third, eat before you go. They do have a cafeteria with pretty good food. However it may be a while before you get to it.
If you have little ones they do have a drop play area. This is great because the little ones can play for hours while you shop.