I agree with Byron, please don't buy the tank and fish on the same day or you will quite likely find you are doing a fish-in cycle which is hard work with its daily water changes.I will most likely buy it/ fish on Friday
You need to set up the tank, put the plants in then wait until the plants are actively growing before getting fish. Taking a photo of the tank as soon as it's been set up gives you something to compare the plants to as they grow.