We were all new at some point! Most guilds/RPers are very accepting towards beginners. People will usually be happy to help if you have any questions, or approach them for RP.
Personally, my best RP experiences have come out of guild interactions.
Since you are looking to play a night elf, I would recommend that you check out the Dirge of Teldrassil. We offer social RP, events and cross faction interactions spread throughout the week.