As said before, don't be in any hurry. This is a project that will take a bit of time. Most all of us have a budget we try to stay in with our own tanks. So don't be embarrassed you don't have thousands to throw at it. I would suggest, when you are ready for corals, that you buy a Taotronics 120w LED
or a Rapid LED
90 watt LED
fixture. Both would be great for your tank and will grow any light loving coral. Looking at between $150 and $300 dollars. Great birthday or Christmas present! Otherwise, your list looks right on. Mixing your own saltwater is easy and I recommend you get comfortable with it, but you must start with perfectly clean water like RO
which you can get from the fish store.
Sorry you had to sell the dragons, they are very cool. You'll like the aquarium just fine, but be patient.
Until then, keep reading and asking questions.