I started the masternode, it appears in the list, but at the bottom of the warning "not stacking because you do not have mature coins", when the coins are mature, will the masternode start automatically? Of course, I'll leave the wallet is running
Yes it is how it should be. As long as they are not mature you can't expect them to do anything. Not sure what the time window for coin maturity is, but you need to let it pass before anything can happen.