Reddit mentions of Lift, Eat, Repeat: Your Guide to Eating Well while Gaining Muscle

UK link

The recommendations regarding Nutrition Data and Calorie King are spot on, but I totally get your frustration regarding figuring out how much to eat, though if your goal is just to gain weight (regardless whether from muscle or fat) it shouldn't be too hard. Get a food scale so you can count calories accurately if you're worried about eating too little, but too much really isn't a problem if gaining weight is your goal. Get a body weight scale too so you can figure out how many calories you approximately need to keep gaining (if you see you're losing or just maintaining weight, you know you'll need more calories).

If you do decide to prioritize muscle gains, I highly recommend this eBook: http://www.amazon.com/Lift-Eat-Repeat-Eating-Gaining-ebook/dp/B00RAR3O8G/

It concisely summarizes a lot of research regarding how much protein is optimal, which types of protein are best, when to eat, etc. It can be very frustrating trying to wade through a bunch of uninformed articles to figure out where to start and this is a quick read to get you started.