Ogre's are completely viable as an army. They are just low tier. Ive always enjoyed my ogres even if ive been playing Daemons and Beasts of chaos lately.
In fact another member at my gaming club is amassing around 25 thousand points of ogres. When it comes down to it they are a fun list and can still win games if played well.
As for building an army Ironguts are king and the bulk of your points after characters should be spent on them.
Gorgers are incredible and i suggest taking 2.
Scraplaunchers are also very good for their ability to do double work as a line breaker (via impact hits and ALOT of attacks) and dropping nice fat killing blow templates on....... well its good at killing just about anything.
do not slouch on characters/gut magic and avoid the hunter like the plague.
If you have any specific questions feel free to ask. Ill do what i can (which is everything nyuck nyuck)