There are 3(2 now) ways to wvw, blobing, roaming and scouting(who does it nowdays? Boring and no rewards)
For WvW starters I always suggest to blob first, follow the commander, know what to do, whats going on...
After you gain experience, you could try roaming, solo or in groups.
For starter, the best option will always be an healer FB, they will always welcome in the squad.
Find a commander in your server and join the squad.
After you know the basics, you can bring your main class to wvw and roam, is okay, you will die, a lot, you will be outnumbered, you will be ganked, and you will be killed by the broken builds. Adjust your build and keep trying. That's it.