case modders HELP! PLEH! AIDEZ MOI! etc etc

[DacoTaco]

XD

ye ok so, soon ill be modding my case cause
1) my cpu fan is going nuts when its under load (and the heat my psu fan blows it is just nuts)
2) always wanted to do a case mod

i was thinking of adding more fans (i now have 2x 80mm fans. one sucking in air on the bottom and 1 blowing out air on top + 120mm fan of psu blowing out air) on the side and/or bottom above the already sucking fan

thing is, i need to get it right from the start or my case is pooped with a nice big hole that i can't fix

so what do you guys recommend in my case?
add fan in side panel blowing on cpu? sucking out air?
add fan on bottom?

im a computer technician but if its about air flow i know almost nothing cause its complicated >_>