K9K manual request

I greet everyone and at the same time, I appreciate the effort to share knowledge with all mechanics lovers. I would like to ask for help on my new vehicle, a Nissan NV200 Combi, and especially on its engine, a 90 CV K9K 1.5 CV Renault brand. I like to know what I have under my foot and how to improve your performance, and how I should pamper it to obtain optimal performance. I will appreciate all the information in manual format that is offered to me.