You can't find Steelix, in order to get one you must trade an Onix to a friend while its holding the item Metal Coat then ask your friend to give it back to receive Steelix.
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i recommend scizor because onix exist in both versions and therefore possible for both firered and leafgreen to have steelix. But, only firered possesses scyther and therefore, better for it
You cant find it in Firered only leafgreen.
You get it on Route 27 inside the cave
You find it in the national park or when trading with Janine (any Pokemon for her Steelix).
Celebi cannot be found in Pokemon FireRed. The only way to get Celebi in Pokemon FireRed is receiving it from an event distribution. These events are sadly no longer supported for Pokemon FireRed.