Yes, the names listed by Trail are in order. None of the ponies you have are rare, but some of them are uncommon and more desirable. Least valuable are Sundance (third pony - white with pink hair, four hearts in a geometric pattern/circle symbol) and Lily (sixth pony - pink with purple hair, wing mechanisim on back, flowers/plant symbol). Starshine (fourth, pegasus - white with rainbow hair, glittery sun symbol) is also fairly common but if her symbols are in perfect shape she can still fetch a good price. Most are in the 3-10$ range of value. The best of the lot would be Tassles (second pony - teal, magenta hair, 3d carousel/blanket type symbol) and the set of twins.
Please be VERY CAREFUL when cleaning up ponies. You can easily end up causing damage and devaluing them if you end up taking off any paint and glitter symbols like Starshine's are fragile. Do not soak - if you get water inside they can rust or grow mould, and should not be shipped wet. The best thing is to wipe them down with a wet cloth and a bit of mild dish soap. I'd leave any more intense cleaning to the future owner.