i am a beginer, i model a simple ball(sphere) and plane, as if ball rests on the plane, then i brought into 8.5 but i can't see the model of plane why? is it becoz of light or ??? but some times it comes

then i want to move the ball(sphere) around the plane. for a while i colud see the ball(sphere) then i after i can't see the sphere after some time i can see it....

i want my camera follow the ball(sphere) where ever it goes how to do it???

can anybody help me plz