Answer: You may be keeping the soil a little too moist. I'd water only after the top half-inch of soil dries out. Roses love sunshine so place yours where they will get all day sun. If you intend to keep it in a container, either put the nursery container in a larger decorative container, or shade the nursery container from direct sunshine. Hot sun can bake the roots of your plant.
Home Depot does have different classes, but not all retailers offer the same classes. You might try contacting your local Master Gardener program or garden club for a list of garden related classes in your area. You might be surprised at the wealth of workshops available.
Best wishes with your new gardening adventure!
Q&A Library Searching Tips