ok that works out at 170litres, so IMO you would be better off with an external filter, although you could go for something like a fluval 4 or similar if you are only wanting to keep smaller species. As for heating you will be looking at a 200W heater
Lights may be slightly harder as they will depend on what types of plants and also whether you wan't to lightly plant or heavily plant your tank, does the tank not have any lighting atm?