Live rock really only needs circulation to work properly itself.
So you are probably fine with the filter IMO
60l is not a lot of water especially after adding substrate and LR
You may still need to add a circulation pump .
The light doesn't matter if you are not keeping corals or inverts.
Fish can care or less about lighting.
It is mostly for your pleasure ..Until you decide you want corals or inverts.
The you need proper lighting.
Jump in the water is fine!