taking train from Guangzhou to HK

Hello I am taking the ride and when it arrives in HK does it arrive an an MTR station? I need to get the MTR to Jordan stop. Or could I take a taxi is it very far from where train stops to my hotel on Nathan Road? Also can I buy my octopus card at the station in HK? No need to purchase before I get there is there?

and I will need HK money I assume there is an atm in the railway station.

Thank you SO much for your help.