I don't get something, PoS and PoW rewards are 0 + tx, so basically just tx fees ? What's the incentive to make people pow mine or stake?
Tx fees is only for PoW miners, it is destroyed in the PoS blocks - that is how deflationary works in 42. Each coin will become more rare and valuable over the time. People are mined to take part in this process and protect their investments.
also how much you need to stake ?
The input is mature and ready to generate the block when the CoinDay is ≥ 1. You can calculate it. For example, the input size 0.04 will be ready to generate the block in 1/0.04=25 days, 0.02 - in 1/0.02=50 days, 0.01 - in 1/0.01=100 days, etc. Minimum stake age is 42 hours, maximum age is not limited.
Also,
You can predict the exact time when each input will find the block with the "scaninput" command. Select from the wallet menu bar: Help - Debug window - Console - type "scaninput" - press "Enter" and follow the instructions. Example:
scaninput '{"txid":"00c3ecf50748b41b63a8e9931845474c9c1d6daace72bae34e1d71080b54be59", "days":30}'
[
{
"nout" : 2,
"hash" : "000005cbefc94bfc6851d95fea7f87ee58498ffc64e9973719cc1f19b433df23",
"time" : "2017-02-25 00:02:44 UTC"
},
{
"nout" : 2,
"hash" : "00000c7e8ecc4c94ed9933601ce559071571f3dc8dea8c74136eb74bbcd1e0d3",
"time" : "2017-03-17 11:47:12 UTC"
}
]