Travelling North

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Ok, my gf's flight is landing in Delhi. I am comming to receive her in delhi. We are thinking of going to some place in north itself and spend christmas there. I am travelling to delhi for the first time. If anyone can help me answer these questions, it would be great. 1) If I come by train to receive her, which station should I get down, as to the airport would be closest. 2) Which is a cheap place to stay with ok accomodations near airport? 3) If we plan to go to up north like Kulu, Manali, Dalhousie, Kasauli etc, which is the best and safest way to travel? 4) Would travelling thru volvo buses make more sense? Just let me know and Thankx a lot.