choose the dome fossil in mt moon after beating the pokemaniac. then when you get to cinnabar, give it to the scientist in the last room in the lab. he'll resurrect it into a kabuto! if you choose the helix fossil, the only way to get it is trade with someone else (or restart you're game if you're that desperate!)
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You must trade a kabuto from firered or leafgreen.
You will need to have a Firered or Leafgreen game that does have kabuto trade it to you.
Level 40.It will evolve at level 40.
In all honesty, it is up to you. The Helix Fossil is an Omanyte, while the Dome Fossil is a Kabuto. Personally, I would suggest the Dome Fossil, just because I love Kabuto.
Kabuto's fossil is the dome fossil