Can someone help me with creating a custom arduino shield

Hello everyone, first of all thank you for looking at this post.

ive built a circuit on a breadboard that works great and want to build it as a shield.

its for an arduino Due (same footprint as the mega) its basically hooking up pins to terminals as well as a wiznet and powering the board from the shield not the power or usb connectors.

please let me know if you can help

There are prototyping shields available. Google Arduino Due prototyping shield.