Player skills/changing positions

Hi, I'm new to the game, and as I've been playing around with it, I have some questions about player ratings:
Off to the side is a section for player skills, which has a skill level for each position. I'm assuming this is very important as it is their rating on position specific skills. However, in a lot of the custom player files, an overall rating and physical attributes are specified, but the player skills are not. How does this work?
How do I change a players position. Let's say I have a 3-4 linebacker that I want to play as a 4-3 DE. The only way I know is to use Edit, and change the players position. However, that copies the player skill over from his current position to the new one. That doesn't make sense... If I move Aaron Donald to QB, he all of a sudden has a 99 skill rating at quarterback. There has to be a better way to change player positions.
Anyways, any help you can give about how to read the player ratings would be appreciated!
Off to the side is a section for player skills, which has a skill level for each position. I'm assuming this is very important as it is their rating on position specific skills. However, in a lot of the custom player files, an overall rating and physical attributes are specified, but the player skills are not. How does this work?
How do I change a players position. Let's say I have a 3-4 linebacker that I want to play as a 4-3 DE. The only way I know is to use Edit, and change the players position. However, that copies the player skill over from his current position to the new one. That doesn't make sense... If I move Aaron Donald to QB, he all of a sudden has a 99 skill rating at quarterback. There has to be a better way to change player positions.
Anyways, any help you can give about how to read the player ratings would be appreciated!