Welcome to the My Tracks section
Elevation is probably one of the hardest things to get right. Its also the most time consuming.
My Advice would be to stick no elevation tracks to begin with, then add 3D features like the pit garages or grandstands. maybe use the Hills info above to add elevation around the circuit.
Only once your comfortable with that level, you'll realise the best ways of running the circuit over the elevation changes.
But please post what you have done into your own thread, as it's often easier to advise on a specific area.
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