Hello here is what i can explain to you.
- The arrows on the curve are called curve normal. They represents the orientation of each points defining the curve twist and also the direction of this curve. First to last point.
You can disable it in the viewport icon dropdown menu top right of the 3dview, near the 3 balls. - Blender is not able to normalize curve on the full length. Subdivisions are managed in between two curve’s points. But there is a trick with grease pencil for sub dividing equally and reconvert it to bezier curve that I m talking about here. Skuax HideOut (downloads included)
- Changing the tip of a curve will be done with modifiers and meshes. Duplicating a mesh along it with array and curve modifier.
Hope it helps.
See you