The Airbag light could be a bad sensor, a bad airbag (not deployed), or wiring that is broken, frayed, or unplugged. IF you decide to look at these things I'd highly recommend disconecting the battery first so you don't end up having an airbag deploy (possible, but not saying that it WILL happen, just trying to warn you of "worst case scenario").
The parking brake light could be a switch (under the emergency brake), that'd be the first thing I'd check.
The ABS light could be a sensor at the wheel (unplugged, bad, or the brakes could be telling the system you need to replace pads), or the control module (under the master cylinder in the engine bay). Those would be the first two things I'd check.
Just my .02, take it for what it's worth, or not...