Change the first 3 lines in the f1graphics like that :
1 ; f1graphics.cfg controls all settings (default 0)
1600 ; [RELEASE] Game 3D Horizontal Resolutionn
900 ; [RELEASE] Game 3D Vertical Resolution
In the second and in the third line you should use your PC resolution ( better ) . The trackpacks you can install through the TSM ( a tracks folder will be created by the TSM ) but don't forget that each one to be installed will overwrite the previous one installed , then you should create a separate folder ( e.g. in your desktop ) and make a backup of the each one after the installation. After all installed , you can just put into the folder tracks in the GP4 main directory all together .
Greetings
Ricardo