These are kind of impossible questions to answer. First, what your pay must be depends on your situation--What standard of living do you want to maintain? What is the cost of living in your area? What are your current fixed expenses? What bills won't change (mortgage, debt, etc), and what can you tweak? It's hard to say, because your taxes will probably change, but I would guess that, to keep stable, you need to make at least 50% more per hour than what you're making now. Plus, you need to consider benefits--are you getting a pension, 401K, or health insurance now that you'll have to pay for yourself?
For educational purposes, you might consider degrees that you can work on in part or in full online. But an important question to consider is what you are interested in. I'm a big proponent of Joseph Campbell's admonition to "follow your bliss." Listen to your intuition. Listen to what brings you joy, and then go there. Don't just follow the money, because it'll only bring discontent and resentment. Instead, figure out what you want, at least generally, then work towards making what you need doing that. (This is the complete opposite of the advice my dad always gave me, by the way, which was "figure out a way to love what helps you prosper, as long as it's moral that is." But for some reason, that never worked for me.
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Good luck!
