Beginner Gardening: Newbie and zone 7 front yard flower layout help, 1 by Loveinapuff

Loveinapuff wrote:
I'm trying to turn my front yard into a place I can grow roses and a cottage type garden, the dogs and the vegetable garden get the backyard! My front yard faces west and is sunny except for by the porch where there is a small overhang. Last year I planted coral bells there and they have done okay I think, even the one that gets all the water from the corner of the gutter above dumped on it. I planted a hydrangea too although I pruned it and covered it with mulch in the fall which I'm now reading may have been a mistake?
There are some plants that were already here, some hostas that is like to divide and space out with the other 2 hostas and columbine I've planted this year, and a ton of nandina. I'd like to move to one oddball one but I don't want that to kill it.
I'd like to plant 4 more roses including the Tahitian sunset one I just got at springfest but I'm not sure where to put it. I'd like to do roses, another hydrangea, lavender, bleeding heart, hollyhocks, salvia, etc. but my budget is super small so over time. We are trying to dig up this area and mulch it, maybe put down stepping stones as a divergent path.
Also I have no idea what that little tree is with the white flowers