For a brand new person, negotiating can be very difficult - everything is new, so you don't necessarily know your likes and your dislikes. Even if you aren't new, those likes and dislikes can change over time.
I have found that completing a BDSM checklist (a quick google search will turn up LOTS to choose from) and use that as your launching board. The ones that are better are ones that allow you to rate your "interest" in something not just whether you like it or not - because, frankly many of those answers will end up being "I don't know!"
It's always good to get play references in your local community, but don't just ask anyone - look to the event organizers, munch leaders, etc!
Also, many don't do it, but don't forget to negotiate after care - you might not know what you will need after a scene but if you do, it's important that all parties involved are aware of those needs! Seems to be one of the most forgotten areas of negotiation.
We were fortunate, and one of our very first munches has a discussion topic every month - the first time we went, they were discussing negotiation! Also, my very first scene was with someone who was VERY thorough in negotiations - even to include negotiations with my partner!
