is the Half Arab the way to go
And when I should I get the horse stuff like grooming things
Lead rope and stuff like that
I need a sturdy horse
I am 5'6'' and 190lbs but I have balance issues with my right side
So, I don't know about the Arab bit, but I do know that there are QH in your size range that will carry your size, and I know that there are horses that are really good with handling riders who have asymmetrical issues (and they're not all in a therapy center or anything).
Wait to get anything the horse will wear (saddle, bridle, halter, straps, fly mask, blanket, etc.) until you get the horse - these things aren't really one-size-fits-all, and you and the horse will be happier if you can get him stuff that really fits. The other stuff - grooming stuff, salt licks, etc etc etc I would watch for that to go on sale. Something I did got me signed up for what seems like every mail-order horse gear catalog on the planet. You, too, can have happy hours shopping for your horse from the privacy of your bed, your sofa, or your bathroom...just request a catalog from horse.com, Dover, and/or SmartPak - this should get the shopping opportunities pouring into your mailbox.