I would highly recommend reading some of the aeration threads, you will quickly be able to pick up the concepts and the "lingo".
Basically, aeration systems pump air and fountains pump water. It is MUCH more efficient to use an air diffuser near the bottom of the pond to circulate water to be aerated compared to a fountain system.
Of course, if the boss lady wants a fountain and you have electricity to the edge of the pond, then by all means add a fountain as a small supplement to your aeration system. Even the hard core "fish guy" pond managers enjoy some nice aesthetics at their ponds!
You didn't really answer my question about the size of your watershed into the pond. Maybe take a sharpie and make a water level gauge using a PVC pipe and stick it in the pond in a place you have easy access. Next time you have a big rain in the forecast, note your water level. Then use one of the apps (or a rain gauge) to evaluate the volume of rain at your property. After a few rains, you should have a decent grasp on x inches of rain equals y feet of water gain in the pond. A 2" rain will be MORE than double a 1" rain, due to the water that soaks into the ground.
Hopefully, that will help you manage your pond in the event that an overtopping event becomes likely.
What are your main goals for the pond? If you start a new thread on that you might get some helpful advice. A dock (no diving rule at your depth) for grandchildren swimmers and boat launches might be nice. Or even a small beach area. It is easier to do some of those things before the pond has filled.
As to fish, you also might need to do your goals. You can usually put in your starter forage base (typically fathead minnows) when you have that little water in your pond. However, it might be a little late in the season for them. You probably need to locate your closest fish supplier and ask them when FHMs are available next spring - that will give you an estimate of when the water temps will be good for their survival.
BG are usually part of the fish goals (great forage for larger fish and good catching and eating for humans) in your area. However, they do nip swimmers if that is a more desired goal of the pond. However, there are substitutes for BG, as the experts will advise if you start a fish goals thread.
Finally, the test strips are usually just fine for basic water chemistry. However, a full analysis after the pond has been full for a while would probably be a wise investment.
