That’s what the Curve tool is for.
See:
- Let's draw an "ellipse" with new users — very basic tutorial on drawing with the curve tool — also see: Let's Make a B (for anyone)
- Logo re-creation: Carbide create help! - #4 by WillAdams
- Carbide Create re-drawing — re-drawing with the curve tool
If you’ll post a design we’ll gladly walk through it w/ you.
Alternately, draw something in solid black and white, then use the Image Tracing tool:
and examine how it puts the curves together using Node Edit mode.