Stick to Cottage Cheese and PB, unless you happen to live on a dairy farm and have no access to other protein sources I wouldn't advise GOMAD, whilst you should drink a lot of bed. Before bed, because milk is full of Casein protein, which are essential and slow working, good for long anabolic periods such as sleep. That's why one takes Whey post workout and Casein pre bed. There are much easier sources of protein and Rippetoe really only suggests GOMAD in the absence of other decent protein sources. Assuming you're here wanting to attract ladies ( And not to become a powerlifter ) you want to bulk fairly clean so that you have to do the minimal amount of cutting required, and not look like **** whilst on bulk. So stick to chicken, beef, fish, offal, venison, whey, cottage cheese and peanut butter, avoid excessive fat ( Such as in 4 litres of milk ), mabye drink 500Ml of Milk before bed to get the vasein, but otherwise I don't advise GOMAD.
If you don't care about what you look like and only about strength, then GOMAD is an easy way to get your protein a day, however I presume that you care a lot about how you look ( Women aren't interested in your 140Kg Squat ) so avoid GOMAD it's only for powerlifters.
I too was in a similiar situation to yourself, I was thin and I wanted to bulk up, I bulked fairly dirty due to lack of access to clean bulk foods, i'm certainly bigger and I look better in clothes but the defenition is pretty poor, additionally my BMI will soon enter the 'overweight' category, I cut in March next year, until then I shall bulk ( albeit using cleaner foods ).