Hi there! Im traveling to The Hague in August for a university exchange program for the fall. Looking for advice/information regarding trains from the airport in Brussels, Belgium to the main train station in The Hague, The Netherlands. Will i be able to purchase a train ticket once i land, or should i purchase a ticket before i leave the States? Also, I'm hoping to do some traveling between countries as i will be there for six months, does anyone have any advice regarding best ways to get around Western Europe and/or spots in the region i should check out?

Thanks so much in advance guys!! :)

Edit: Thanks for the info guys! Also, anyone have good recommendations for booking international flights online? (Houston --> Brussels)