What did you want to overclock your current pc/cpu or your new pc?
The Asus team goes into detail on each setting, it looks like a lot but it really isn't.
All you really need to play with is the cpu core ratio and the cpu core voltage. Then you have the cache you can overclock as well as the BCLK. I'm sure you know temperature controls how far you can overclock your cpu.
You can set the LLC (Load Line Calibration) to medium for best results. Set to extreme the LLC can overshoot the cpu core voltage.
This November/December broadwell cpu's will be released and will work with the z97 board. If you can wait til then that would probably be the best for you.
What is the problem you are having after updating the bios?
Feel free to ask all the questions you want.