No detail imported stl file

[luke11cnc]

I'm very new to Rhino 5 and also very green to 3d drawings
I have bought a stl file to cut on my home made cnc spindle cutter with cut3d now
when I import the stl file into Rhino I can only see the out line with no detail that is visible in my cam program (cut3d).
The main reason I'm trying rhino 5 is to add text to a banner within the drawing. With a ultimate goal of drawing my own bas relief drawings and bowls.
I would like also guidance on how to add text to the banner
here is the screen shots of what I can see in my cam program



This is what I can see in Rhino 5





James