Creating Meshes

Question

I know it's a silly question but........... how do I create meshes using vertex buffers index buffers and vertices?  I really don't know how to ....... For example...... how do I create a mesh having those vertices:

v[0].Position = new Vector3(0,1,1);

v[1].Position = new Vector3(-1,-1,1);

v[2].Position = new Vector3(1,-1,1);

and how do I draw it?

 

 I really don't know how to