JohnK wrote:

When being assigned a hold, will ATC usually assign an altitude as
well?

In the Northeast US, I always hear altitude included in the holding
instruction.


Secondly, what happens there is a holding pattern used to enter an
approach to landing, and there are multiple aircraft landing?

At airports without radar coverage for the approach, only one aircraft will
be cleared for the published approach at a time. Other aircraft inbound
will be placed in a hold well outside of the approach until the aircraft on
approach cancels IFR, either in the air or on the ground.

At airports that have radar coverage on the approach (controlled or
uncontrolled) aircraft are simply vectored to the final approach course and
any published course reversals are bypassed.


--
Peter