Clutch problems?

Someone else was driving my van and said the gears would not engage so they had to get underneath and force it into 1st gear to bunny hop it back home. He said the clutch needs replacing, but my brother in law(ex army mechanic), an apprentice mechanic and a wrecker have all said it is NOT the clutch. My brother in law said its the master cylinder cause there was oil around it, but the apprentice mechanic helped me change it and noted something had been cross threaded and believes that was the source of the oil leak after replacing the part we tried to bleed it through but couldnt get pressure to the clutch, so upon further investigation he now notes that the slave is not engaging, but my brother in law swore its not the slave for some reason, now the guy who was driving it in the first place is saying the slave is not engaging because the thrust bearing is stuffed and for that I still need to replace the clutch! I'm getting confused, I already had to forgo paying rent this week to pay for the master and I cant afford to just replace everything randomly untill it works, I need to know exactly what the problem is, but I cant afford to call out a mechanic to look like I said, im broke! I can only afford to try to save for the actual part that needs replacing. Can someone please help me troubleshoot this. Its a Toyota Tarago '89 2.2 efi