I tried to come up with an order of how important rules are in general. Of course it always depends, but as a weak player I need something to hold on. This is what I think. Please leave a comment on how you would change the order. For example if you think pawnstructure is more important than center control and so on.
1. Applying tactics
2. King Safety
3. Complete Piece Development
4. Queen Exchange and Attacking Pawn Moves Considerations
5. Having a plan and switching between plans
6. Exchange Rules
7. Open & Closed Game Rules (if you have knights keep position closed)
8. Piece activity
9. Center Control
10. Control over other keysquares
11. File control
12. Healthy pawn structure
13. Piece harmony, safeness and improvement
14. Attacking and pressuring points
1. Applying tactics
2. King Safety
3. Complete Piece Development
4. Queen Exchange and Attacking Pawn Moves Considerations
5. Having a plan and switching between plans
6. Exchange Rules
7. Open & Closed Game Rules (if you have knights keep position closed)
8. Piece activity
9. Center Control
10. Control over other keysquares
11. File control
12. Healthy pawn structure
13. Piece harmony, safeness and improvement
14. Attacking and pressuring points