Yard maintenance help required

Hi, I got a new home just recently. There is a lot of space left for let for the garden. The yard was maintained very nicely with lawn and garden by the previous owner. What I am thinking is that I can still increase the garden area. So I need to make some changes in the yard to make it more engaging. I also have an aquarium with me. Is it a good idea to place the aquarium in the garden and just have it covered with a roof. I think this would bring a great vibe in the garden.
Some of our lawn decoration grasses and other materials like river rocks will be trash.
What to do with the junk? Can I rent a commercial dumpster and have it hauled off? I’m thinking about using some junk services near Toronto ( https://www.redbins.ca/service-areas/toronto/ ), but I don’t have any experience with such firms. Does anyone have any input on such a service? Any help will be much appreciated.