Well a 1200VA UPS should be able to handle about 800W peak power (including monitors and whatever else you have hooked up to it).
Since you system has a 550W PSU, I'd say you should be good with that UPS. I doubt your PC gets over 300W. It's good to have some headroom for your UPS tho. It will last longer on battery and be able to sustain power even at peak loads.
You only need your PC and your monitor hooked up to the battery, since that's all you need to shut it down safely in the event of a power loss. It's also a good idea to have low powered, sensitive things like a modem/router on battery. Things like powered speakers don't need to be on battery and can be hooked up to the surge-protection outlets.
Once you have the battery charged a great way to test it out is to unplug the UPS from the wall and see if everything stays on.
I'm curious what brand/model of UPS you purchased.
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