No dipstick on fill plug in front of shifter. The check plug is under the foot plates. The Allen head plugs go into the bell housing where the clutch is, not into the tranny, (IIRC). The starter safety switch is on the range shift lever, and is that wire coming out of the shift cover. You can unplug it and just short across the plug and it will turn over with the key.
Ford tractors are really bad about the clutch sticking, and it frequently takes a repeated shock load to break them free. I see this 2-3 times a year and have never had one not break free, but it occasionally takes an hour or so of hitting things with the clutch pedal held down.