I think that hacres.com has a lot of concise help.

I go vegetarian every year for about a month, normally when i do my yearly system cleanse. One of the most important components in my vegetarian diet that i look for is protein. I try to choose vegetarian products that contain sufficient daily amount of protein for an active adult male. Since i work out regularly i try to keep it at the no less than 100 grams per day minimum. But protein isn't really the only important component. If you need to become vegetarian for good then i would create a list of nutrition, vitamins and minerals necessary as a daily minimum and then search for their respective vegetarian sources. That, of course, may appear tedious and challenging at first and may take some time but as soon as you build your own vegetarian library of necessary nutrition and such, tailored to your individual needs, then you will have a clear view on how to organize your daily recipes as well as what to shop for when going to a store (knowing exactly what you need may also save you on your grocery budget). Good luck with your quest and make it a hobby too, that way you'll bring some fun to it as well ;-)

Mnemo