Creating a routing program - the basics

Hello, I'm currently on university, and for my graduation paper, I'll be 
implementing a routing algorythm, by hand, in C.
The routing algorythm itself is not easy, but one of the starting parts 
of it, is to find a way of discovering the MAC that it is currently 
connected to, maybe is bether if I draw, since I'm not really that good 
in english:

[PC with n NICs]-----(n cables)---->[n PCs]

I have full control of the first PC, of course, since is the one I'm 
implementing the router, so I do know the MAC of it, but how to discover 
the MAC on the other end of the n lines, so I can start sending packets?
Anyone could help me impĺementing this exact thing? I think I got the 
theory right, but I have no clue how to start programing.

Thanks a lot.

Mateus

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