Decent filter with good biomedia (ur tank is around 11 litre). Judging by the volume, space is a constraint so a hob filter would be good.
Thermometer is good to have but not necessary, and plants u can have depend on the lights u are going to provide. Moss and anubas can have airstone, but since u are going to change to a hob, u can remove the airstone once u start to introduce funas (airstone helps to cycle water faster due to constant supply of oxygen)
U will also need some soil to buffer the ph level of the water. Good to have water test kits too else u will have to test water with commando shrimp or fishes like guppy
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