Im not sure how to load and rewind film into my Nikon N2000 camera. Can someone help?

The camera should operate perfectly fine without a lens. It should also operate perfectly fine without film (other than for not taking any pictures, of course).
I know this is stupid, but make sure the batteries are inserted in the proper direction. Then make sure the film advance mode selector around the shutter release button is not in the "L" position. L is for Lock, S is for single-frame, and C is for continuous.
If you need a manual you may download a copy here.

Yes, make sure there is film in the camera, and check the batteries and camera cintacts to make sure they are clean. Use a pencil eraser to makethem bright and shiney for best connection.

It means "Film remains in the camera after film rewind complete."

If this is happening after shooting, the remedy is simple: open the camera and remove the film. If this is happening right after loading the film, then you've got a more serious problem: the camera is rewinding the film upon loading.

Make sure there is no corrosion on the battery contacts. If a battery corroded only a little it can foul the contacts enough so no power gets to the camera. Use a pencil eraser and scrub the contacts until shiney. This is the most common problem I have with it.

Draw the film all the way to the receiving spool. There's an 'eye' inside the film compartment to check that the film is loaded. When the film is not correctly loaded the camera thinks it's empty and rewinds the film.

Move it a bit (some half circle)back and forth. The slot may be in wrong position related to the roll inside. It should click in when you get the slot in right angle.

life up on manual film rewinder to release the the back to load film

Pull up the film rewind knob to open the back.

Drop the cartridge into the well on the left and, while rotating the rewind knob, push it back down to secure the cartridge.

Pull the leader across and insert it into any of the slots in the takeup spool.

Make sure the film perforations engage the sprocket teeth.

Alternately wind the film lever and press the shutter button until the perforations on both edges of the film engage the sprocket teeth.

Close the camera back, making sure it latches.

Take up the film slack by rotating the rewind knob in the direction of the arrow until you feel resistance.

Make blank exposures until the counter shows "1".

There's a fuller, illustrated set of instructions in the manual, which you can download from http://www.butkus.org/chinon/nikon.htm

There is a collar that is around the shutter release button. You lift the collar and turn it.