The fossils are obtained in mt moon and the pewter city museum. Either you will get kabuto or omanyte from mt moon depending on which fossil you chose Omanyte=Helix fossil, Kabuto=Dome fossil. Aerodactyl is the old amber you get at the pewter city museum send these to the lab at cinnibar island to get revived!
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You can get one of the fossils after defeating a scientist at Mt. Moon. You can choose from either the Dome Fossil, which becomes Kabuto, or the Helix Fossil, which becomes Omanyte.
Fossils cannot be created in Pokemon FireRed, there is a finite number of them to find.
only if you trade with a friend
You can't, you have to trade over from FireRed or LeafGreen.
Aerodactyl is revived from one of the fossils that you receive in Mt. Moon.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.