anyone know where I can start with tuning an Astra 1.7dti, please?

[activedial]

Hi all would just like to know if anyone with good experience can help/ show how to map tune a 2001 Vauxhall Astra 1.7dti, as i have no clue other than I can maybe get better bhp or fuel economy. I have an op-com interface, is there any other tools / software I need? Any help would be greatly appreciated. Many Thanks all.

[activedial]

I suppose I should learn more about the subject of my question by searching forums & search engines, before asking a basic question. I was just hoping someone could fast track me through it!