First off, welcome to the BJJ world!!! I've been doing it for a while and I love it!! While its not the end all be all of MA, it does provide you with an excellent understanding of fighting on the ground as well as in the clinch range.
OK...for your question. Can you learn BJJ from a book?? Can you learn to cook a gourmet meal from a book?? The answer is yes to both. However, against someone who trains under an instructor or someone who went to cooking school...well, the fact remains that you'll never be as good as the person who put in the time. This is especially true if you've never had any grappling background to begin with. I have some BJJ tapes, that I use as a reference point. I have a few people that I train BJJ under. Because I already have that background, its easier for me to understand the concepts from the tape better. Again, that is not my sole learning tool.
My advice to you would be to find a BJJ instructor. Doing a search online or asking someone here, I'm more than sure you'd have some luck.
As for the basics...YES!!! That is the most important thing. You can know 100 submissions, but if you can't maintain the positions and dont understand the basics, then those subs. are not gonna do you any good.
Good luck in your search and if you have any questions, please feel free to ask!!
Mike