You may use the following line, Registering is not necessary:
sgminer --kernel nist5 -o next.awiki.org:8186 -u yourICEaddress -p . --queue 0 -s 1
The mining will start on the p2pool once the block value is >0 (not yet...).
20 blocks to go before the real start.
11 blocks to go before the pool gives work to miners.