I wouldn't do much differently.... I say that and then while thinking... A lot as changed. But lets skip equipment...
I started with live rock and sand. I would skip the live sand just because I did not enjoy the look of it.
I would skip GSP
I would either skip zoas, or I would confine them to their own rock.
I would skip Palys
GSP is a weed that a flamethrower can't get rid of.
Palys are a very real threat to humans
Zoas pose some of that, but they also grow at different rates, and some can easily take over rockwork.
So I am in process of thinking about how many rocks I need to get from Gulf Live Rock to replace what I do NOT like that I started with. It won't be easy, and while I'd love to find a local reefer that could use what I'm taking out, if I do find such a user it will have to be very well coordinated - I'm not set up to store 100 lbs of live rock and wait for a buyer/donatee, so sadly this live rock and tons of zoas is going to die.
I'm not exactly happy about that, but I do want to claim back my rock, and there isn't a safe enough way for me to do that with the toxins risk (even from zoas).