I was going to try to not reply because it is going to be hard to do so with restraint.
BUT
that is what a properly fitted saddle should look like. This is not my horse and i do not ride western so forgive me if anything is slightly wrong.
Are you all feeding the horses or just tossing them out on pasture? what are you doing in regards to that because i know you are new to this and im concerned that they are being cared for properly. Pasture is not great in MOST of the country right now. So you should be using a minimum of a bale of hay a day in addition to grain if you are not ankle deep in grass yet. Just my .02. My gelding is currently eating a bale and a half a day and that was in addition to winter grain.
NEXT
"the only expierence I've had with horses before these were petting some on the other side of the fence"
you need to stay on that side of the fence. . . At least in regards to THESE PARTICULAR horses.
you don't need these horses at all. nor do the people who gave them to you. they will take them back and then they will not get enough to eat once they mow down the grass again.
sorry to be mean but either way they need SUITABLE homes.
The harness horse may be better off being an amish buggy horse than being tested tested tested by inexperienced horse people till she becomes so frusturated she hurts one of you or till she becomes so dangerous to work with that she'll be useless for anything but auction for the rest of her life. The amish actually ( in what ive seen here and in Pennsylvania) care deeply for their animals that they use in work and day to day and care for the far better than 'mainstream' society. the blind horse, which noone has any business trying to ride in a strange , new place away from her companion btw . . . should be found a companion home with safe fencing and people willing to leave her alone and just enjoy her being a horse. Horses are not toys. if you all want to ride, rehome these horses and take some lessons with the money you are spending currently. After you ride a while invest in safe tack, not bargain old broken stuff that you have laying around.
There are tonssssss of horse trainers in the world. and many many many of them keep the few and far between good ones in business fixing their mistakes.