We were in a similar position early last year. So, first, congratulations on adding a horse to your family!
Now, as mentioned above, talk to and listen to your trainer. He/she is an invaluable resource for help and information. Find out who was the horse's previous vet and see if you can get the records (with the previous owner's permission). If you decide to switch feeds, do it slowly! Get a bag of the old food and you start with a 90/10 mix old/new and gradually change the percentage of old/new until it you reach 100% new.
Start an emergency fund. Even if its only $10-$20 per week, you will need that money sooner rather than later! In our first year, I probably spent $1,000 on emergency vet care. (Our mare is very talented at finding hazards in her paddock. We still haven't figure out HOW she injures herself!)
You and your daughter should both ask for lessons on ground work and lunging. I don't ride often, but I've still managed to build a strong bond with our mare by doing ground work with her. She loves my daughter and respects me. My daughter and I can both lead our mare without touching her. It's pretty neat. :)
Just like an emergency fund, be prepared to spend an extra $100 - $200 a month if you plan to do more than just go to the barn and ride. Our first year, I spent around $7,000 on stuff for both my daughter and her horse (grooming tools, saddles, bridles, saddle pads, show clothes, blankets, sleezies, leg wraps, etc.)
That's what comes to my mind first. Owning your first horse is an amazing experience and my daughter and I have bonded over the horse. We spend lots of time talking on the drive to and from the barn and Acey has really brought us closer.
Good luck and have fun!
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