#2 to start mixing you also need
-enabledarksend= Enable use of automated darksend for funds stored in this wallet (0-1, default: 0)
That is only needed if you want to send mixed coins by default. If you only want to mix, you don't need it.
If you have a password you will need to unlock your wallet for mixing. 1000000 is time in seconds. The true indicates unlock for mixing only.
dash-cli walletpassphrase password 100000 true