I have had the diagnosis about a year ago. They are our previous threads here about sleep. There are also support groups online. A simple Google search will give you all the information you need.
From what you say, I am not certain of your need to supply oxygen. That is to say, an oxygen tank. What you probably will get is a CPAP machine that will force air through your nose and probably mouth as well. There are a number of force settings to offset the blockage. The blockage comes about when tissues in your throat sag as you grew into the unconsciousness of sleep.
Believe me, the idea of sleeping with a mass connected with the plastic to to a machine blowing air in your direction is much worse than the actual practice. It took me no time to adjust. I have known people who never made the adjustment. It's strange to me, considering the alternative. No one, to my knowledge, has ever died using a CPAP machine. Plenty of people, on the other hand, have simply stopped breathing because of sleep apnea. Look at it seems as positively as you can. They even come in "smart" traveling cases. They are not that much trouble to travel. Be sure to get a machine has a humidifier.
As they are letting you do a second night, that probably means you are in the moderate category. The computer figures out the numbers. That means something close to 30 sleep events an hour. For all practical purposes those are times that you stop breathing and your brain has to wake up your breathing mechanism because of oxygen depletion. If that process gets short-circuited, you die.
I wish you luck.