The higher the number, the lower the quality. Avoid roses with waxed canes as they may never grow. Avoid buying the leftover plants at the end of bareroot season, as they might have grown lots of foliage but no roots to support that foliage. Before you order your new roses or go to the nursery, you should have a good idea in mind as to how much space in your garden will be allotted to the new roses. You don't want to be caught in the predicament of bringing home more roses than you have space for.
Roses love lots of sun, although some can survive in partial shade.
A rose bed that has morning to midday sun, with afternoon shade will provide protection from intense summer heat. Never plant roses directly underneath trees, because they will compete for nourishment and water, and the trees always win the competition. They should be soaked at least overnight, or for up to a week maximum. The bleach helps to sanitize the plant and may prevent diseases like root gall. The vitamin B1 helps to get the plant off to a quick start and avoid shock.