Camera problem

Well u see i started a new .blend file and deleted the camera and light so i could clearly see what i was doing with my model. and i’ve been making good progress as well. however, i want to render some still images and when i inserted the camera and positioned it, and then tried to render it, i get an error message. as it happens, i cant seem to be able to view anything from the cameas perspective and when i try all i see on screen is grey. im sure theres probably a setting somewhere that makes it an active camera or something similar but i cant find it. could anyone please let me know how to fix this please?

Select camera. Ctrl + Numpad-0

You don’t need to delete it, you can move it to another layer with MKEY.

i know about the layer thing but icouldnt be bothered. thanks anyway though