MOD = Mitchell On Demand (repair manual software)
Where can I find a view of the engine comparment, so that I can find the fuel and air filters?
Look for the big air duct going to the top of the engine, the other end of this goes to the air filter
You don't need to replace the fuel filter and it's almost certainly not in the engine compartment, but rather under the van.
You can get a wrecking yard TCM from the same make and model and engine size vehicle, try swapping it out. You also can try cleaning the contacts of the plug going to the TCM and the selonoid pack on the transmission.
Almost certainly your van is worth less than $300 on the used market. You might look into a trade-in through the cash-for-clunkers program if you live in the US. As long as the check engine light isn't on when you trade the van in, you can get the voucher for the program.
Ted