Landscaping is my hobby. So I have never used a program. Are you looking to plant perennials, annuals, trees, shrubs?
I am in yr 2 of this house and slowly getting there. I suppose the issue I have with the "programs" is that is does not take into account how your flower bed is, plant growth/type, availability, bloom times, fall color, etc. and your level of care.
If you have "sticks or poles" you can use those for "height". I do that a lot.
When you do buy something you don't plant it right away. You kind of set it there and look at the look and move it around.
Plant in odd numbers of three/five unless your house is ultra formal and you are going for that look.
Right now you can plant pansies, phlox, ground covers, etc...So which reminds me, I need to run to Home Depot this morning since I saw the plants are in!!! Thanks!