The wheelchair lift on your coach is manufactured by Lift-U, a division of Hogan Industries, and they're built in Escalon - off Highway 120 east of Manteca, not too far from you! You might even be able to order a shop manual for it! http://liftu.hoganmfg.com/support/manuals.aspx
Thousands of these things are out there, and they're actually very dependable (one of the main reasons they're the most popular). Having trained a LOT of drivers on their use, I can probably thoroughly confuse you about it's operation. So here goes the basics (main coach engine must be running, parking brake set, transmission in N, fast idle on):
1. Lift's controls are on the RH side of the dashboard. Push the white button in the center row to turn on the power. If there's power to the lift, the button will light up. If it doesn't light, either the bulb's burned out or there's no power to the lift. Figure out which.
2. The lift operates in a simple L > R then R > L pattern of the toggle switches along the bottom row. If the light's on, press and hold down the toggle switch below the red button. If the lift is working, this will extend the platform out from it's hiding place under the 2nd & 3rd steps
3. Once the platform is out, move the center toggle switch down to lower the platform to the ground, or up to raise it to floor level.
4. If you lower the platform to the ground, then move the RH toggle switch down to lower the outer barrier/ramp.
5. To stow the lift, reverse the sequence - barrier up, platform up to floor, platform back to steps.
(If you'll notice, the toggle switch action is actually intuitive: pressing down takes the platform to the ground, pressing up brings it to the floor.)
6. Once stowed, press the red button to turn off the lift's power.
7. Sometimes, especially on rough roads, the lift may wiggle out from it's parking place. When it does, the yellow button's light should come on. If that happens, simply stop, turn the power on and re-stow the lift. You might have to extend the platform all the way out first, depends on how it hiccuped.
Now, outside the coach, in the compartment above the RF headlight (that's held shut with duct tape in the photo), is the remote controls for the lift. Basically the same as the bottom row on the dash, same order, same function. Often these will work when the dashboard's doesn't. Depending on the coach, you may also have a hydraulic pump in there. If so, it's to help you re-stow the lift should there be an hydraulic failure. Note that if you have to use the pump, you must also hold the appropriate switch in the direction you want the lift to go.
Fuses or circuit breakers for the lift are in the panel to the left of the driver.
Now, about the driver's seat and a couple other things: There should be a push/pull knob under the LF corner of the seat. Pushing it in adds air and raises the seat, pulling it out releases the air. That's if it's an air-ride seat, of course. If you are close to or over six feet tall, you may or may not end up with the seat literally against the driver/passenger shield. If so, you'll find this bus terribly uncomfortable for anything other than short drives - look at how the driver's area is suspended & framed to better understand.
Standing in the vestibule area, looking out the windshields, look up to the upper RH corner of the coach. You'll find a small rectangular "trap door." Inside that door is a on/off toggle switch for the rear door interlock system.
Air release for the front door is a 90o
valve located either near the floor on the LH side of the driver's seat, or on the front of the side electrical department. It's usually mounted so that if you had a stick shift, it would be to the L of the ball of your foot when placing it on the peddle.
Droopy eyelids, enough for now.
FWIW & HTH. . .