Let me illustrate this with a little story, this happened a few days ago: I went to my local growers market as I do most Saturdays and I was nearly finished with my shopping when I spotted some fresh figs, figs are one of my favorite fruit and I had dreamed of figs the previous night and assumed they were out of season. I decided to come back to the stall and purchase some if I had any cash left after getting a couple more items. Unfortunately I couldn't and left the market to meet a friend. While she was ordering us coffee at our local coffee house, a man approached me with a tray of figs and with a flourish offered me one of the fruits! I was gobsmacked! I totally believe in the Law of attraction, but that was so random and unexpected a way to get a fig!
To make the Law of Attraction work you must develop a strong desire for whatever it is you wish to attract.
My strong desire combined with the visualization [seeing the figs, dreaming about them] was enough for me to attract a fig, and it all happened within an hour.
Visualize what it is you want
Develop a strong desire for the outcome
Do not get too attached to the outcome
Ask the Universe to provide this or something better
Always make sure that what you ask for is for your higher good

