First order of business would be the battery....you don't want it sitting around in a discharged state.
The battery probably hasn't been destroyed. I've fully discharged my van's AGM battery twice (by accident, of course) and recovered it. I even joke that the full discharges must have been good for it as I bought that one in early 2011 and it's still going strong more than eight years later. I also fully discharged the battery in my ATV last winter and recovered that one and still use it.
If the battery's voltage reading is near zero, the load that took it down is still on it. If you disconnect it, I'd bet you would see voltage rise to a few volts. That rise can be important as many battery chargers won't charge a very deeply discharged battery.... they'll just declare it bad.
Given your experience level with elec-trickery and the constraints on your time, I'd recommend taking the battery to a professional battery shop. I'd disconnect it today (Sunday) and make calls first thing tomorrow to line up someone to recover it. I'm in PA so of course have no local knowledge for Medford or Grant's Pass. I've taken a quick look on the web and think I'd probably try the Interstate Batteries shops in either of those towns. I see Battery Solutions seems to carry some quality brands so they might be okay too. I'd avoid auto-parts stores like Advance Auto, Autozone, O'Reilly, etc.
I'm assuming you bought the Renogy AGM battery. If you have a battery charger with AGM-specific settings, you may be able to recover it yourself. The key issue would be whether the charger's program will refuse to charge an extremely low battery. If that happens, there's a way to fool the charger but I'd rather not get into that kind of witchcraft at this point.
PS- if you do take it to a battery pro, measure the voltage as it's turned over to them. That could be useful info.
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