Check out the "Forks Over Knives" cookbook. I recently made the transition to a vegetarian diet as well and have found this book to be incredibly useful.
I also recommend www.happyherbivore.com and www.fatfreevegan.com So many recipes! I've been experimenting with vegan cooking partially as a result of watching Forks over Knives (available on Netflix). The best cookbooks I've found are actually the Forks over Knives Cookbook and, for a more general (not low or non-fat and whole foods only) book, Veganomicon is recommended for all vegans. It's comparable to a classic like The Joy of Cooking, but vegan!
A great thing about these cookbooks and sites is they often go through and explain how to stock your pantry as a vegan, what ingredients do that you might not have seen before, what cooking terms are used and why many go vegan, so that made me feel really comfortable and supported using them.
Good luck! I hope you enjoy whatever you experiment with :-)