Hey @joluvian ,
First to the PS, to upload a screen capture, you can use the viewport render option. Top left of the 3d viewport is the View menu. You will find in the menu a viewport render option. This will give you a render of the 3d viewport as you see it on screen, no camera or lights required.
You can add the image here using the add image tool.

An image maybe useful to help answer question 1. It maybe the normals or it maybe the the surface is not flat. Try recalculating the normals. Also take a look at the Object Data Properties, under geometry data. If you see clear custom split normals data, click the button. It should be add not clear. If it already says add custom split normals, then its not that problem.
With the camera, by pressing 0 on the numpad the view jumps to camera view, you want the camera to move to the current view as you look on screen (1 – front view), for this you need to press 1 for front view, then CTRL+ALT+0 for the camera to snap to the position to match the view.
If this doesn’t solve your problem, try again uploading some screen shots.
Hope this helps.