There are many, many, MANY, vids available on youtube and my suggestion would be to watch as many as you can before you take the next step. I personally found Grimmgreen, Todd (todd's ecig reviews), and a few others very helpful and now also like Twisted420 a lot as well.
Keep in mind that moving to mods won't change "vapor production" by themselves as they are, in the end, tubes that hold batteries. What matters are the atties (RBAs, RDAs, Tanks, etc.) and you will need to find what's right for you. Before you move even think of moving into the world of rebuildables please get very familiar with battery safety, there are many great vids and pages that explain that as well.
These days you don't have to go to rebuildables to get big vapor and flavor but it's still your best bet from my experience. That being said I have been constantly surprised by the vapor and flavor produced by my Nautilus Aspire with the BVC but also have to admit that the vast majority of my gear runs rebuildables.
Know what you're after before you buy anything. Remember, knowledge is power. Many here will be happy to give you gear suggestions but I think the best next step would be for you to decide where you really want to go as there are a lot of options.