"The 33"-Road Bike Racing - Questions on building a road bike

This is my first road bike and my budget is around $1200NZ, I have done research but am still a bit unsure on buying the right components. If you guys could just tell me a few things like what parts do I have to look out for sizing for, like the cassette and the crank, if I buy a whole groupset on Ebay that would make sure all the components fit but how do I know that the crank and cassette would fit my frame. Also Im really unsure about the brake calipers, how do i know the caliper would fit on my frame and would reach the wheel in the right position, thanks in advance for your help, I will just post a thread if I get stuck again.

You already have the frame then? I am definitely no expert here but I think that if your frame was built as a road racing frame within the last 5 years you should be able to fit any campy/shimano 9 or 10 speed stuff on it. You can always measure the frame spacing. You will want to know what threading your Bottom Bracket has, Italian or English and also the fork diameter to get the correct size head set.

The frame is a 2004 Orbea, I bought it second hand and the guy told me most off the details, it said BB width 68mm/English, is it refering to the bottom bracket, also for the hubset what do I need to look for in sizing, it also says the frame takes a 32mm bottom pull derailleur, could someone please explain what that means, and it takes a compact crank. Im not to sure about all those terms so if you could just help me out there. Thanks.

best bet is to ask at the Bicycle Mechanics or Road Cycling forums.