Hi all,
I am new to gardening and never plant anything. But I have this area in my unit.

I want to clean up but would love to keep some plants if possible. And I want to plant small and colourful plants that have flowers all seasons.
I am thinking to buy the following plants from Bunnings. Do you think it is a good choice? I want to cover the whole area with small plants and then have a bigger/longer plants like roses in the middle.


How do I prepare the ground? What types of soil should I buy?
How do I calculate how many bags I need?
Those plants comes with small grid pot. Should I remove those pots or put them with the pots?
If those flowers are nota good choice, please suggest me.
Thank you.