If u read the stickies i suggest reading them again cuz u shouldnt have to ask if oats r a good carb source yes they are! One of the best..

Carb sources: oats, brn rice, sweet potatoes, lentils, fruit occasionally only while bulking.. (i only eat the first 3 personally cuz i know they work).. Some people (maybe u) can get away with whole wheat pasta and white rice and occasionally bread but i shy away from recommending them..

Id recommend building a diet including only the complex carbs i suggested and once u get it down if u want to experiment with other sources have at it.. Just keep a close eye on ur bf%.. fruit id limit to meal 1 or around ur workout and only while bulking.. The milk id at a minimum reduce it to maybe 2 8oz servings per day max.. A good source of casein is lowfat(2%) cottage cheese.. Mix some sugar free jam in there its pretty good!

Also i believe carbs r gonna be ur cheapest source of food.. Oats go a long way for relatively low cost.. Sweet potatoes may be a little pricey .. (my wife does all the shopping )

U def wanna include some greens into ur diet as well.. Spinach, broccoli, asparagus..