can anyone tell me if i book train ticket online,will i be able to pick the ticket at the station? and is it possible to have online booking during January(winter vacations)?? please someone help me

Yes. Online booking is available all th time. Anytime you need a reservation, you could sumit your order on this site. They will purchase the tickets for you and you could collect the tickets from the railway station. You need to know there are always a lot of travellers at the railway station during the holiday. You need to queue for a long time for the tickets.