what will i need for the hdloader
 

What do i need for the hdloader? Can i just put in a harddrive from my computer and start playing Or do i need something else?

No. You need a Network Adapter for the IDE interface. From here you can then plug into the console. A lot of your questions are answered in the HDLoader Review - I suggest you read it if you haven't already...

No need to post more than one thread on this as the other one is about the HDD Advance which we were helping you out with already.
Lufcfan has pointed you in the right direction. You will find your answers there in the HDD Loader review thread. ;)