Ok, so we finally got our tank!
It's a beauty, I must say. So we went shopping, got fine sand (white and black), some small stones, some bogwood and some plants. My dad has cleaned the aquarium with a wet cloth, and as we speak is in the process of cleaning the sand and putting it on the tank. Then he'll put the plants in and fill it with water and then I shall begin the cycling procedure.
So, while my dad was cleaning the aquarium, I was doing tests to my tap water and I have a PH value of something in-between 7.5 and 8.0. Also, I tested for KH and Alkanity and I got the following values: 12.5 (KH value in dKH) and 4.45 (Alkalinity in meq / L). Is this normal or is there something wrong here? (I am still googling about these values).
Everything is looking good though! ^^ I just thought the top of the tank would be a bit more... resistant, at the lack of a better word. Looks too flimsy, and I fear my troll cat might damage it or break it.
I also realized I was utter dumb and bought myself an air pump that is nowhere near fit for my tank size <.< So we bought a new one today while we were at the store. I feel stupid and that's like 25£ wasted. My dad says he's got another use for it though, so I guess not all is lost
I'm sure some questions will popup, and I'll come back here.
Thanks to everyone for all the help so far