To feel good on any diet, you need to know a BRIEF amount of nutrition information.
I highly recommend this "starter kit". It is written by a vegan and registered dietician. It is brief, it relies on hard facts, and it has useful recipes.
Guide to Compassionate Living / Starter Pack
I would read it over and maybe write down what you eat for 1 - 2 weeks just to see if you are hitting your nutrtion targets. After that amount of time you will have an idea of what to eat and how much.