Dig a large hole and make a soil mound. Spread roots out on mound. Mound with soil to prevent canes from drying out. Gradually wash away mound as the rose grows. Slow soaking is best, drip systems are ideal, be careful to not wet foliage if watering in the evening.
Roses thrive on light regular feeding.
Again a soil test is suggested to know what your roses need. Begin a feeding program when new growth begins in the spring and continue through Labor Day. Special rose foods are available. Light regular feedings are the most effective. A good mulch is a must in Dallas in the summer.