Your first question, standing in front of the vehicle facing the motor, towards your right side, near the drive shaft. Better angle of sight would be to remove the left front wheel, when on safety jacks, follow with your hand on the drive shaft towards the tranny, just about 2 to 3 inches up from there is the filler plug the tranny. remove that and stick your finger into the hole. (lol engine off obviously), Now bend your finger downwards about an inch. If you don't see oil on your finger, then either 1 ; top up with tranny ep 90 oil, or 2; drain tranny oil and here you top up until it over flows. Basic thought on your 1st question. However, There could be other reasons why your stick don't move in or out. If there is no odd noises coming from the tranny, then yes have your master and ***** cylinder checked, but also keep in mind that the bar from your stick to the tranny may corrode at the joints eventually. Meaning, there where any movable connections are between two items or objects, you will find either a plastic type bearing or some sort off engagement type item. They may be worn out. (a good indication to this is the travel distance inside of from neutral to any selected gear number), what I mean is when still new the gear lever inside the cab will travel a short distance into the selected gear position. As time goes on this travel distance may be longer. Another point to look out for is the Teflon bush the gear selector shaft at the gear box may expand due to heat of gearbox after even 20 min drive as well. Other than that you may find your tranny is on the way out and may either need a major overhaul or exchange. If you do want to exchange, I recommend to dig deep and purchase a new box. Hope this helps...