I would get at least one fan, 2 may or may not be necessary, I only have one and my CPU temp and system temp never goes above 40 degrees C. The fan I would install at the back under the Power Supply and make sure its sucking the air out of the case to the outside( I usually check this with a bit of tissue if theres no markings on the fans ). If you do install one at the front make sure its sucking the air in from outside, this way you have one fan sucking air into the case and one blowing out so you get good airflow.
Yes thats exactly what you do. They are to keep the motherboard off the case to stop short circuits, only put them where there are holes in the motherboard, if you place the motherboard in the case you should be able to see which holes in the motherbaord line up with which holes in the case.
Ive got a feeling it's going to be a long weekend, thanks to all above i've calmed down a bit know and am off down to maplins to get some fans and tool's will keep all informed of progress and will most likely be driving people mad with questions!!!!
Good luck with your build.Don't worry about asking questions..thats how we all learn..Dont be seduced by too many fans though as they can be counterproductive in moving the air round the case if you have too many in the wrong places!!Keep your wiring routes as tidy as possible and try the round IDE cables as they help airflow round the case interior..Be careful with the CPU cooler when you place it on your processor and you should be o.k..Don't go forcin'...Keep askin' Good Luck taylor44