Firstly I totally agree with Beakor's comments.
As a Captain, you'll soon learn that flying the aeroplane is the easy part of your job. It's managing "the day" that requires a lot of your time. There's no right or wrong way of doing things, you have to do what's comfortable for you. If you want to put another 2000kg extra fuel on then do so, but make sure if asked you, can justify this with a suitable reason.
Know your manuals inside and out, especially SOP's.
Each airline is different, but in my final command Sim check I was briefed, "the only holes in the excercise are the one's you dig yourself ".
Have confidence in yourself and you'll be fine.
Cheers Sid D