bapi eclipse java sapjco3

How to connect to a SAP System using sapjco3 and Eclipse?

I need to connect to SAP Systems via standard BAPI calls. I already installed JCo (sapjco3) and added the .jar to my build path in Eclipse.

But due to the fact that I am rather a beginner regarding network/server programming, I have no idea how to setup a connection between Eclipse and the SAP Systems…can anyone provide a basic solution or some ideas for that?

Thank you and greetings!