Everyone here pretty much nailed it. Find a good group of LS/FC mates to work content with, and most of all be open about your experience. The game has many people that'll help explain content.

Most of all, don't take abuse or trolling from other players. Just blacklist them and move on, they're are so many people that are helpful that you'll be able to progress without issue. There are a number of sites with guides that are helpful for content as well:

Dungeons & Regular Primals
http://eorzea-source.com/

Extreme Primals and T5
http://shinra-ffxiv.guildwork.com/fo...-public-guides

Everything else - Why the commentary is sometimes lengthy, the points are typically valid.
http://www.youtube.com/user/Xehanort1227/featured

Hope that helps!