Will Agate coin be minable when main net is launched?
No, that is POW and Agate is POS.That means you will be able to stake Agate instead of mining it.
Will there be some minimum amount needed to join stake campaign?
To start masternode you will need atleast 50,000 AGT.But if you have less you will be able to join public pools.
Ok,thanks you for the answer.50k is not too much,ay decent invesotr who really believes in Agate should be able to aford that!
Thats true,and as it was aid before,others with less AGT will be able to join other public pools.