can you take a photo?

have you removed the spacer?

the bearing is just a little brass bush which can be tapped in with a hammer, you will need to buy it, it locates the end of the input shaft from the gearbox

you say you cannot mount the flywheel.. why? the bolts do not line up (there is only one way they will line up, you need to keep rotating till you find it) or you cant sit it in place or what???

be careful to use manual flywheel bolts as they are different length, and use a locking compound to ensure they don't come loose

you will also need to align the clutch plate before attempting to put the gearbox on