Let me repeat... Food, Food, Food...
I have a desk job and it's a pain, but with some planning you can get your meals in. (Even though you may get the occassional stare from someone)
Laytownking... I reread your post and realized I didn't really answer your question... Without really knowing your bf% and what not, I'd suggest about 150g-190g of protien/day and around 350g-400g of carbs/day (and that's probably on the low side) if you're looking at a target weight of 180-190lbs. I'd try to get this in 5-6 meals, so you may have to slowly work yourself up to eating every 2 1/2 - 3 hours. Keep in mind that if you're planning on bulking that you're going to be putting some fat on as well, but that's why we have cutting cycles.