We all began at some point, and as you go on you realise that there will always be some aspect where you are still one; that and the fact that when you are dealing with living things things change all the time. Mistrust advice from people who say 'Always' or 'Never'
Welcome to the forum, do you have any other bits of garden, like out the front? Footballs can be pretty destructive to flower beds, as can small boys retrieving them. I have a friend who has a tiny back garden, maybe nine or ten feet each way. His two boys turned it into a mud bath with a ball; he put a narrow raised bed down one side and astro-turf on the remainder, it actually looks pretty good. People have different ideas about what to do with gardens, look about and decide what you want, and when it gets to buying plants remember plants are not like most things, the more they cost the better they are; not with plants. The easier it is to propagate and usually to grow, so the less the nurseryman will charge less. That does not mean it is less attractive necessarily, so look at the cheaper plants.
Just thought, sexist of me, my daughter was in the primary school football team about twenty years ago