i cant see my fp model and i have no idea whats wrong

do i like need to move it or resize it or what i can see the gun model on the ground in my map but when i pick it up i cant see it i can only see the hud and reticle oh and how do i edit the globals and the hud so it doesnt saw blah picked up the pistol?
if u can help me i would be soo thankful
-bio