Your tank should be about 27 litres if my maths is correct A bit small for most fish to be honest, but would make a perfect shrimp tank! The main thing to consider with smaller tanks is that water parameters can vary much more and more care is needed to keep everything stable as smaller volumes of water are less forgiving.
You don't say how powerful your light is, but you should be able to grow most plants in a tank that side especially with CO2 injection. You could also consider a liquid carbon instead of homemade yeast CO2 or you can get mini gas systems as well.
Plant wise it's down to personal preference, but choosing smaller leafed plants will help give a sense of scale e.g. Hemianthus callItrichoides, Anubis nana bonsai, Elocharis acicularis, Pogostemon helferi, Staurogyne rubensis, smaller crypts, etc.
I want a shrimp tank now!!!
If you drink too much, expect to wake up in the strangest places! img