I have made my new altcoin based on Litecoin 0.13.2
The first problem I found was to mine few first blocks.
As miners like cpu-miner, bfg-miner etc was not working at all, I don't know why.
I used the old Litecoin version 0.8.x with embeded miner software, which solved my problem.
Problem number two is, how to premine my new crypto currency?
Let's say I want to award to myself 1mln coin before I release it, but I don't want to wait ages till my PC premine that 1mln.