Exactly, you got it  You can sent normal DASH (not anonymized, ie: without darksend) or anonymized DASH, you have to darksend them before.

Check my first post I edit it with a link for more information.

Yes, is ahead of time mixing so is not transaction based privacy, you decide how much money you want to keep on your private balance and the level of privacy you want to have and then the wallet mixes the coins for you up to 16 rounds, and then your private balance is there ready for you to spend at any time, without you having to wait for peers or remix you just send them directly as any Bitcoin transaction. It is really cool because it provides a high level of privacy while keeping the same mechanics we are used to with BTC.