How to create (mine or premine) first coins in proof-of-stake cryptocurrency?

[gorus5]

I have read about POW and POS proof type.
I have little understanding of how to create first coins when cryptocurrency uses POW proof type.
You need to connect at least two nodes and start common mining.
But POS proof type works based on possession some value of coins. BUT how to create first coins if I need coins for mining?
I have read a lot of google search pages but didn't found a detailed explanation how should it work.
I just can't understand the principle. Because you need coins for mining, but on start, there are no coins.
So I stuck in a loop)