Welcome to the arena! I can't help with the ponies in the first photo but in the second photo starting at the top right they are:
Mommy Sweet Celebrations, Posey, Tickle, Trickles, Applejack, Banana Surprise, Bonnie Bonnets, Minty, Dancing Butterflies, Pretty Vision, Brilliant Bloom, Sugarberry, Bowtie and Seashell.
Third photo is:
Tootsie, Shoreline, Applejack, Fifi, Skydancer, Sparkler, Windy, Princess Tiffany, Parasol, Glittering Gem, Firefly, Parasol, Fif, Tic Tac Toe, and Seabreeze.
4th Photo is the dance and prance set, Tap Dancer, Twinkler, DJ, and Twinkler.
5th pic is Baby Moondancer, Baby Surprise, Speckles, Puddles, Christmas Baby Pony, Dangles, Jangles, Squirmy, Spunky, Kingsley, Surf Rider, Zig Zag, Pockets, and a Fairy Tail Bird.
6th pic the large white pony is a soft and sleepy newborn named Hushabye and they can be worth quite a bit. The smaller playset is the Poof and Puff Perfume Palace and the large one is the Paradise Estate which is the largest playset ever made for ponies and thus pretty pricy.
Hope that was helpful! You've got some good stuff! Hopefully someone can give you some accurate values for them!