I just got my first pendulum, too, gilokez! I'm jumping into runes, scrying, and the pendulum all at the same time...
I've found some contradictory advice in surfing for useful tips online. For instance, some people say to ask the pendulum to show you what its yes and no responses will be, while others say you have to program it to adhere to the yes and no responses you yourself determine for it. I have no idea what way is "The Right Way," so since I like the first option a lot better, I just asked mine to show me its own yes and no responses...
Which led me to another "Which way is the 'right' way?" question: which hand do you use??! I started with my non-dominant hand, thinking I'd be less able to influence the outcomes that way...but the pendulum kept responding with the exact same response-motion no matter what I asked it. Then I switched it to my dominant hand, and it gave me a clear response for what its yes answer will look like, a different yet equally clear response to illustrate its no answer, and then it answered a few follow-up verifying questions with total consistency...so I'll be using it in my dominant hand! I do still wonder how other people roll out on this issue, but ultimately, given the way this pendulum responded to me, I think I at least have my own answer for using it.
Maybe the best advice is to read up and solicit opinions, but then really experiment a bit to see what resonates and works best for you as an individual with each specific pendulum?
Good luck with yours -- I'm already enjoying using mine!