There are a surprising amount of these threads. Your supervisor should have recommended a few papers to read to 'get things started' with your research. Even if they only give you one or two articles - that's enough. Read them, then read the articles they refer to with parts that you want to know more about. Rinse, and repeat. With enough iterations you'll eventually pick up for yourself which articles may be considered seminal and which opinions are a bit more obscure.
Make notes when you are reading, as well. Otherwise, it isn't really necessary to 'choose a journal' to read any more. There is so much research out there, and it has been going on for so long, that you're better starting with a breadth first search. Use Google Scholar, google the keywords that you're interested in and you should find plenty to get started.