Help with PORTS

[Apocalipsis]

Hi everyone.

I forked bitcoin,BUT idon't understand something about ports and ip.
Can I put my localhost ip(127.0.0.1) to RPC and P2P ports and ip?
For example,I want to create Genesis Block.
1)So can i write 127.0.0.1 and any port,at main.cpp,and init.cpp?
2)I need to create bitcoin.conf in my Roaming/Bitcoin ?

Please give me examples,what i should to write in /src/main.cpp and in other .cpp.
And what i have to write in bitcoin.conf
To create first genesis block(so it should start mining on localhost)

thanks

[Apocalipsis]

So can somebody say me,if I can to mine Genesis(first) block,on my PC(i have not got permanent ip)?
What Have i got to write in files like bitcoinrpc.cpp,etc/
thanx