I am going to start a planted tank soon, and since it's my first attempt I'd like anyone that knows roughly what they are talking about to have a look at the list of equipment below and tell me if I am heading in the right direction or if anything needs updating/changing.
Aqua One Regency 80 tank (180l 80W x 40D x 70H cm) I know it's a weird shape tank but it was free

Eheim professional 3 250 2071 canister filter
Dennerle Eco Line Thermo Tronic 40W undergravel heating
Dennerle Disposable 300 Quantum CO2
4x Hagen Life Glo T5 HO 24w
tank hood covered with Mylar instead of standard reflectors, I don't know if it's better but it was fitted by the previous owner
JBL aquarium thermometer
Eheim air pump 400
newave 1000 powerhead
Vecton UV8 steriliser with T5 8W uv light
I have not decided yet but I will probably go for the Topica Plant substrate (1 bag of 5KG should be enough? or could I use 2 and have a deeper substrate?) I have not decided on the gravel yet but something quite light in colour I suppose since it's such a deep tank...
What do you guys think? any advice?
thank you