Firstofall, I am sorry if my question is to broad.

I am developing a tile based game and switched from those gl.Begin calls to using VBOs.

This is kind of working allready, I managed to render a hexagonal polygon with a simple shader applied.

What I am not sure is, how to implement the "whole" tile concept.

Concrete the questions are:

- Is it better to create 1 VBO for a single tile and render it n-Times in 
  every different position, or render one huge VBO that represents the whole "world"

- Depending on the answer above, what is the best way to draw a "linegrid". 
  Overlay with the same vbo using the respecting polygon.mode , or is there a way
  to let the shader to this?

- How would frustum-culling or mousepicking work then, do i need to keep the
  VBO-data in memory?