You need to assess your soil, which way your space faces in relation to the sun and also your weather in order to pick the right plants. Do you want lawn and beds or pots on paving/stones etc. I get the feeling you are not in the UK. What you can grow in one country can differ a lot to others.
You need to decide if you a growing a little or a lot.
How big is your garden, do you want to grow in pots or the ground.
What direction does your garden face?
Get a book for beginners