Hi and welcome to YT, from a fellow Okie! I applaud you for even considering a rescue yorkie/yorkie mix. I've recently become involved with OK Yorkie Rescue and have found fostering and seeing dogs go to their forever homes the most rewarding experience ever.
I'm currently fostering a yorkie mix male, "Skip", that is adorable. He was found in a kill shelter in Arkansas and rescued by our group. Skips favorite thing to do is to play ball....he would love it on the sports fields
Yorkies can be sometimes stubborn about potty training. But with consistency and patience they usually do get it.
Good luck with your search and hope you find your buddy soon.