From one newbie to another:

1. Should I level to max before learning another class?
With the way classes work you're best off leveling all of them fairly evenly, cross-class/discipline skills, job requirements etc. Not to mention that a lot of those crafting skills require materials from other skills as well, and the market boards can have some price gougers in there (voice of experience), so you're best off going DIY, provided you have the time.

2. What is the best way to make moola in FFXIV?
By not spending it, ideally. Nearly everything you do in this game makes you money in various degrees, so you'll never have a problem in that department. It's just a matter of not blowing a hole in your pocket, especially if it would only save you a few minutes of time (again, voice of experience on that one :\ ).

3. Do I need to do any homework before Satasha?
Just a YouTube video and/or Google, just to get a feel for what you're up against. The early dungeons at least, have mechanics that have to be respected, but they're not rocket science. Basically, you get better at running dungeons by running dungeons, not by /dancing.