congrats! She sure is a cutie, I love the bold coloring. What is her height?
Entertaining minis is actually fairly easy if you've ever worked with a fullsized horse before. As stated, they can do just about anything a 16hh thoroughbred can, with the exception of riding. I actually find miniature horses to be more enjoyable than fullsized horses because of their size and how easy it is to transport them, etc. I personally enjoy playing 'dressup' with my mini (she wears the same size clothes as me!
great for desensatizing as well.) taking her to 'for fun' shows (she is registered and show quality but I personally just do not like the show atmosphere.) setting up 'courses' for both of us to jump (you don't need an expensive set, a broom and some lawn chairs, a few 'scary' flowers, blocks, beanbags, etc are perfect building material!) going for walks (many trails atleast in our area are absolutely fine with me taking Sour on humans trails providing that she wears a red ribbon and a diaper) lunging, ground driving, grooming sessions, obstacle courses (perfect for teaching to back up, sidepass, etc) and her personal favorite- hangout and graze time. It really is calming to just sit and read a book while your mini grazes besides you...for both of you! Parades are also lots of fun, as well as nursing home, school, etc visits. I personally do not participate with her in the last few due to personality quirks that makes her not-so-ideal for large group situations, but most minis love the attention.
As for feeding, I give Sour a quart of miniature horse and pony feed and an all-she-can-eat mixture of grass hay and alfalfa (BE CAREFUL with alfalfa, as it can cause colic when fed in large qualities. I use a 3 to 1 ratio and that is more than enough.) If you show, you're going to want coat suppliments and such, but they are not necessary otherwise. I also keep Sour on a dry lot because gastronomic problems are very likely with miniatures.
Good luck, and I'm excited for you! Keep us updated =]