You're not leveled nearly enough to do any raiding yet, not even normal VoG. It will let you in at Lvl.24 but it doesn't mean you'll be useful. You'll get one-hit-killed by pretty much everything especially when enemy levels reach 28 near the end. You also need weapons leveled past at least 280 to do full damage against Lvl.26-28 enemies. They don't all have to be legendary, but they should be upgraded past that damage at least. If you can find a group to carry you that's great, but you're not going to be able to contribute much of anything.