Hi Mitch,
Welcome to the SPS game.

I have a few general suggestions and hopefully you will find them useful:
1. If you don't have a RO/DI unit, I would strongly suggest that you get one.
2. Get yourself a good reliable skimmer (if you don't already have one).
3. Eventually, you will need to thinking about alk, cal and mg. Start thinking how you are going to supplement / automate the addition. The popular choices here are 2-part, calcium reactor or a combination with dripping kalk.
4. Flow is the second most important factor besides clean stable water quality, a single mag18 won't be sufficient so starting thinking how you can supplement more flow.
5. You will soon realize there are lots of ways people use to keep N & P in check including Zeovit, carbon dosing and solid carbon dosing (aka bio-pellets). I would stay away from those until you have a specific need. Don't just run them because everyone else is running them. A simple system will be easier to maintain and you will enjoy it when you aren't constantly under pressure to do something.
6. Start thinking how you could prevent pest from entering your system. For example, would it be feasible to set up a QT so you can drip newly acquired SPS? If you don't have a way to prevent SPS pest, it's a matter of time before you would have to deal with them in your DT which is a huge pain.
7. Take photos of your tank and corals every 2 weeks. This will allows you to see changes that you might not notice. It's a great way to document and be aware of changes that are too slow to be noticed.
8. If you stay in this hobby long enough, you will make mistakes (no matter how careful you are) and bad things will happen to your tank (inevitable), don't over react. Frequently, it's not the initial mistake that causes SPS to decline but the subsequent fix-it action that further stress the corals to STN or RTN.
9. Set your expectation low and reasonable. TOTM tanks don't happen overnight. Enjoy the process of keeping the tank; not necessary the end product. Good things will come to those who wait; have patient.
10. There are lots of LE or designed type of SPS in this community. Avoid buying into the hyde and start with easy, colorful SPS to begin with. A healthy fast growing no-name purple SPS beats a LE PM growing .5 every 2 years any time of the day.
11. Start thinking about how to automate your tank. Look at it as a 3 to 5 years projects. Anything that requires you to do daily or weekly will be hard to keep up with (and you will quickly loose interest). Feeding and water change is inevitable but the majority of everything else can be easily done with a little planning and controller.
Good luck!