Daemonettes are fine if you're going all slaanesh, otherwise fiends, seekers, and heralds on chariots are better, and plaguebearers and pink horrors make better troop choices.
Fiends are one of the deadliest close combat units, point for point, in all 40k. They're definitely worth taking. Their models are expensive and silly looking though, so most people just use the plastic chaos spawn kits for them.
Keepers of secrets are fantastic, especially if you give them musk. Just remember that they're not invincible. When not in close combat, keep them hidden.
The Masque is fine, but she's easily killed. Still, if that doesn't bother you, she can really mess with an opponent's army for a turn or two, before dying.
The seekers of slaanesh, daemon princes of slaanesh, and heralds of slaanesh are the only other slaanesh units in the codex.
Seekers of slaanesh don't actually have models (we're still not sure why), but you could easily model them on cold ones (lizard men lizards) or virtually any other steed, or do what I did and combine daemonette models with cheap spider riders from ebay, turning them into daemonette-spider centaurs.
Daemon Princes of Slaanesh are good for Pavane, but generally need to be cheap to be effective. I'd give them ironhide and pavane. That's all.
Heralds of slaanesh are only good on chariots. Give them musk and unholy might. Again, they have no official model, so just use a fantasy chariot, or make one from scratch, with homemade seekers pulling it.
Good luck!
Fiends are one of the deadliest close combat units, point for point, in all 40k. They're definitely worth taking. Their models are expensive and silly looking though, so most people just use the plastic chaos spawn kits for them.
Keepers of secrets are fantastic, especially if you give them musk. Just remember that they're not invincible. When not in close combat, keep them hidden.
The Masque is fine, but she's easily killed. Still, if that doesn't bother you, she can really mess with an opponent's army for a turn or two, before dying.
The seekers of slaanesh, daemon princes of slaanesh, and heralds of slaanesh are the only other slaanesh units in the codex.
Seekers of slaanesh don't actually have models (we're still not sure why), but you could easily model them on cold ones (lizard men lizards) or virtually any other steed, or do what I did and combine daemonette models with cheap spider riders from ebay, turning them into daemonette-spider centaurs.
Daemon Princes of Slaanesh are good for Pavane, but generally need to be cheap to be effective. I'd give them ironhide and pavane. That's all.
Heralds of slaanesh are only good on chariots. Give them musk and unholy might. Again, they have no official model, so just use a fantasy chariot, or make one from scratch, with homemade seekers pulling it.
Good luck!