Your best bet is to just wait a little bit longer. It's about that time man, just a few more months til outdoor harvest, and the trash can technique requires way too much time and effort, and you have to be consistent with it otherwise you'll just end up with a stressed out half-flowering plant. Just let nature take its course, marijuana has been flowering all by itself outdoors for a long ass time.

And for cloning, you want to get some rooting gel or powder, a sharp cutting tool (like a sterile razor), and something to root it in (rockwool, rapid rooter plugs, or just dirt even). Basically you cut off all excess vegetation except a few leaves, and cut the clone at an angle just below a node, dip that part in cloning solution, and then put it in your medium. You probably wanna put like a clear plastic cup over it and mist it with water to keep it humid until it roots. Do a search, there is a little more to cloning than that, but thats basically the idea. If you keep humidity and temps right and use cloning solution, you can root in like 3-5 days depending on your luck.