Just take a breath, stop ordering fish, and stabilize your current system. Read through the concientious marine aquarist from front to back, and adujst the parameters of your current system according to the book.
It will get better, but you have to be really patient and let it stabilize. The CBS and damsels are tough dudes and will most likely survive all of this.
Scooters are not easy to keep for beginners, they need food in the sand. Donate him to a reefer in your area with a DSB
DOn't be so hard on yourself, just SLOOOOOOOoooooooow down and read, read, read, read. There is an abundance of stuff on this forum to browse through too.
If you stick with it and be very patient, you will have a system one year from now that you can be proud of, it it will still be a "young" tank.