You can download the wallet and start staking your coins as soon as wallets become avaialable (in 4 days). Early investors will benefit from the low PoS difficulty, so if you're not a miner we advise you to participate in our crowdsale to start staking as soon as mainnet launches.

As for the masternodes...yes, TRAID does support masternodes. MN collateral is 60,000 coins.