Compiling project

Hello All,

I am new to the ARM environment and I have just received the source code 
from a company that designed and built a controller interface using the 
LPC2387.

I need to be able to make changes,compile and upload this code.  They 
used the Realview Development Kit 2.1 and FlashMagic to upload.  I have 
no makefile.

I have looked at trying to use Eclipse and various other methods.  I 
have downloaded Yagarto Toolchain but I keep hitting a brick wall.

Any hints, guides would be very much appreciated.
Cheers
Dean