I hope that the flock will be somewhat resistant to parasites.

I will have to do fecals to make sure of the worm load. Even if the sheep prove to be somewhat resistant I will have to keep up the fecals.
On the rare seasons that we have water (El Nino) we have to be careful about turning our animals out to graze. We have to still feed them with dry hay in the mornings before turning them out to avoid founder and clostridia. Then they don't always want to come back in at night if there is sufficient green grazing. This draws the coyotes and makes the LGDs work harder. If we get a rainy season this year, I will pull all the sheep off the barn/creep field and off the breeding pen pasture in order to get some forage to grow. It won't be enough for the number of sheep I have now, but those 2 pastures will give them some grazing just for their enjoyment. When I had fewer sheep and we had an El Nino couple of years, we didn't have to buy hay for 4 months!

And the lambs made 80 lbs. by 4 months on grass alone. Of course I now have about 4 times that number of sheep.
Any change in feed is a problem and there will be a
BIG change in feed for the sheep when we move to Texas. I will have to gradually change the sheep over from alfalfa to grass hay and pasture. If I move the sheep back during the winter, and feed them on hay until the pastures come back in spring, I might be able to get them switched over to pasture easier.
I need to double check the protein content of alfalfa against pasture. And do a soil test to find out what minerals are present or lacking in my soil. Since I am currently feeding prime alfalfa (southern California alfalfa is some of the best, containing a good measure of selenium and other necessary minerals) I will have to test for selenium and other minerals in my pastures when switching the sheep onto Bermuda grass. Alfalfa is 14-20% protein while Bermuda grass hay is only about 8-10% protein, with changes in protein count depending on whether the hay is first, second third cutting and when it is mowed. Considering protein percentages, I may have to provide a protein supplement during breeding and lambing, particularly to my lactating ewes and lambs. Loose mineral and salt will be much more important on pasture. Right now we use a good quality trace mineral salt block in all pens which seems enough.
The calcium percentages in alfalfa are much higher too (about 3X) which can lead to a lack of phosphorus. This is why feeding alfalfa hay or pelleted feed to rams and bucks can lead to urinary calculi. Urinary calculi are tiny calcium stones that form in the bladder and when passed through the urethra can cause blockages. These blockages prevent the animal from urinating and can cause death if they are not dissolved or removed.