The thing is that I have hundreds of nodes each with 4 to 12 images all of them around the same size in an imagefield but I want to order that so it looks at the end in a grid or something like that.
I know that panels and views are the answer but I think I've seen all of the tutorials available but nothing.
If anyone know where can I find something like I need, I'll be very gratefull.
First of all your question is incomplete, What language are you using? What framework if any? What Database if any?
Views is what you want. There are lots of good screencasts and tutorials out there, but you might not find one on exactly what you're looking for, because Views + CCK are uber flexible swiss army knife kinda tools.
You'll want to create a view of this node type with the images, change the view from nodes to fields, set the display to grid, and then add the imagefield as the field. Voila.