Setting up reefer 170

[MasA07]

Good evening all, I’m getting ready to set up my reefer 170 and have a few questions bear with me. I’ve had a couple 20 gallons about 8-10 years ago and noticed things have changed a lot. I’m looking to do this right.
1) live rock or dry rock? I plan on adding some live rock to my sump regardless, but what is recommended and where to get it? Local or online

2) live sand? I planned on getting the Carib sea but open to other options.

3) do I need to add bacteria and ammonia?

4 equipment list
-hydra 32HD
-Nero 3 wave maker
-Red Sea reefmat 250
- tunze ATO
-no protein skimmer yet.