excel chart marker

Hello,

I would like to:
1. add a marker on an excel chart that could follow a trace, jump from on trace to another
3. plot a small sign(say a triangle) on the point
2. write the x,y values on a multiline-dropdown textbox.

I understand that that would take some VBA programming.

I just need a jumpstart. A full code would be welcome too.

Thanks

Katto