@Jamestl, welcome to the site, and to your new home!
One good thing to do before planting (and you can do it now to determine how to move forward) is to map your sun exposure. How? Well, on a day that you're home, take photos every hour or so of the area where you would like to plant. Name each picture with the time of day. Then you can tell exactly how much sun you're getting (how many consecutive hours and when). Then you will choose your plants based on their needs.
Another consideration is the wall behind the plant. Sometimes, walls can reflect so much heat and light as to burn the plant. Some plants just don't do well up against a wall, especially where the wall gets a lot of direct sunlight hitting it and especially if that's happening during peak sunshine hours (i.e., morning as compared to midday).
For watering, I guess some people do it mathematically, but I usually give it the finger test. To do this, stick your finger into the soil and if it's dry all the way down, you need to water. If the soil is moist to a depth of two inches or so, it's fine. Daisyl's advice about watering is excellent.
You should tease out the roots of a potted plant so that the water won't just run off around the rootball, especially if they're rootbound (that's when the roots are very crowded in the pot, sometimes growing in the shape of the pot). There are lots of good videos on YouTube showing how to do this. I agree that Home Depot isn't the best place to get gardening advice. If you didn't tease the roots to spread them out when you planted, you can easily (but carefully) dig them up and do it. Here're a bunch of videos:
https://www.youtube.com/result...
And, the Home Depot out this way offers a guarantee on all bushes, shrubs and trees. If they die in the first year or three (?), they'll replace them for you free of charge.
HTH!