Do it, no better time than now!
There are ton of useful tutorials and stock photos out there, you don't really need much to start, for starting studies you just need some references of people. I save everything I can, both models and bodybuilders and other types of bodies, because they all kinda look different on the surface and it may be confusing.
Maybe later you will find out you lack some knowledge that prevents you from understanding details of what's going on on the photo (that's what I am coming from right now, I just have an itching desire to finally get all this stuff), but generally you don't need to go and understand all the muscles 